Domain: Natural Science — Physics
Target concept: Beer sprays out in a straight line from the small hole.

Video generation prompt: Place an unopened beer bottle on the table, drill a small hole at the bottle cap, and then strike the body of the beer bottle with a stick.

Evaluation guide:
(i) Target concept: Orifice-driven laminar jet formation under transient pressure surge in a sealed, carbonated liquid container.
Minimum mechanism: Bottle must be sealed and carbonated; cap must remain attached with only one small hole; strike must transmit impulse to liquid (not vent gas prematurely); hole size must be small enough to constrain flow into a jet (not leak or burst).
(ii)Storyline: [Frame 0–2] Stable setup: unopened bottle upright on table, cap fully seated, hole visible at cap center. [Frame 3–4] Stick approaches bottle body; no contact with cap or base. [Frame 5] Stick contacts bottle body and transfers momentum; bottle does not tip or lift. [Frame 6–7] Delayed response: no motion until after contact completes. [Frame 8–10] Beer ejects as single straight jet from hole only; no other exit points, no bending, no branching. Perspective: fixed frontal/slightly angled view showing full bottle, cap, hole, stick contact zone, and jet path in one continuous field of view; no cuts, zooms, or occlusions.

Manual:
Experimental Procedure
1. Place an unopened beer bottle upright on a flat table.
2. Drill a single small hole precisely at the center of the bottle cap.
3. Strike the cylindrical body of the bottle firmly with a rigid stick.
Observation of Experimental Phenomena
A straight, continuous jet of amber-colored beer sprays outward exclusively from the hole in the cap immediately after the strike.
Summary of Experimental Principles
The strike creates a pressure wave that compresses the CO₂-saturated beer, forcing it through the small orifice; due to the constriction, the liquid exits as a coherent, straight-line jet governed by conservation of mass and Bernoulli’s principle.

Prompt Grounding rubric:
level_1: No unopened beer bottle appears; no bottle cap is visible; no hole is visible in the cap; no stick appears; the bottle body is never struck; no beer sprays out.
level_2: A beer bottle is present on the table, but the scene is missing or misrepresents at least one required element: the cap is absent or clearly broken, or no small hole is visible in the cap, or no stick appears, or the stick never touches the bottle body.
level_3: The bottle stands on the table with its cap intact and one small hole visible at the cap; a stick is present and contacts the bottle body at some point during the clip, but the strike is not clearly shown to happen before beer sprays out, or no spray of beer ever appears.
level_4: The bottle stands on the table with an intact cap showing one small hole; a stick strikes the bottle body, and beer sprays out afterward, but the spray is not a single straight jet (it curves, splatters, or sprays in several directions), or the spray starts before or at the same instant as the strike rather than clearly after it.
level_5: The bottle rests stably on the table; the cap is intact with exactly one small, clearly visible hole at its center; the stick visibly strikes the bottle body (not the cap or base); only after the strike is complete does the beer begin to move; beer then sprays out as one continuous, straight jet coming only from the hole, with no other leak point, no branching, and no mismatch in timing between the strike and the spray.

Scientific and Causal Correctness rubric:
level_1: No beer ejects from the bottle at all; or beer sprays from the bottle's mouth, a seam, or the side wall instead of the hole in the cap; or the ejected liquid is not beer-colored (not a translucent amber/gold); or it looks gaseous, solid, or opaque white; any of these contradicts how a struck, sealed, carbonated bottle should behave.
level_2: Beer-colored liquid does eject, but from the wrong place (the cap's edge, a thread gap, or the bottle mouth rather than the hole); or the flow comes out in pulses or spurts instead of one steady stream; or the stream is visibly curved or fans out sideways rather than travelling straight; this breaks the basic cause-and-effect of a pressurized jet forced through one small orifice.
level_3: Amber, translucent beer sprays continuously from the hole in the cap, but the stream is not straight (it arcs, drifts sideways, or widens into a cone); or spraying starts before or exactly as the stick hits the bottle rather than clearly after; or the liquid looks unnaturally thick with no misting at the exit, or unnaturally thin and pale, losing its amber color.
level_4: Beer sprays continuously and only from the hole in a straight line, clearly starting after the strike, and keeps a consistent amber color and translucency throughout, but a small secondary issue remains, such as a few stray droplets on the bottle's outer surface, slight side-to-side wobble in the jet, or brief foam at the exit that doesn't change the main stream.
level_5: Amber, translucent beer sprays exclusively and continuously from the single hole in the cap; the jet is straight and keeps a steady thickness along its visible length; spraying visibly begins only after the stick fully contacts and leaves the bottle body; there is no foam collapse, no liquid running down the bottle's outside, no second stream, and no bend in the jet's path at any point.

Spatiotemporal Consistency rubric:
level_1: The bottle's position or angle jumps between frames instead of moving continuously; the cap goes missing from view then comes back; the stick passes through the bottle without any contact; a shadow vanishes and reappears with no cause; the bottle's shape suddenly bulges then snaps back; or the jet appears out of nowhere with a visible gap between the hole and the stream.
level_2: The bottle stays roughly in place but visibly jitters or briefly hops in position without any cause; the cap appears to spin on its own, independent of the bottle; the stick starts or stops moving instantly with no sense of momentum; the jet flickers on and off instead of tapering off naturally; or the table or background warps at the moment of the strike.
level_3: The bottle stays put on the table, the cap stays fixed to the bottle, and the stick's contact point on the bottle body stays consistent; lighting and shadows stay coherent throughout; the jet emerges smoothly from the hole with continuous motion, but a minor flaw appears, such as brief motion blur that hides the hole/jet origin, or the hand or stick briefly blocking the hole so the very start of the spray isn't fully visible.
level_4: There is no teleporting, no broken geometry, no lighting jump, and no motion glitch that breaks the cause-and-effect of strike-then-spray, but one small, non-core flaw remains, such as a faint lens flare exactly when the jet starts, slight jitter in the jet tip's position, or a small highlight shift on the bottle's surface that doesn't affect recognizing the bottle.
level_5: The bottle's position, angle, and size stay constant across the whole clip; the cap and hole stay visible and fixed relative to the bottle; the stick's motion shows natural speeding up and slowing down; the jet emerges with no visible gap or jump from the hole, travels in an unbroken straight line, and keeps a steady thickness and opacity for as long as it's visible, with no geometric, lighting, or motion glitch anywhere in the clip.