Question: When did a vandal with a knife cut The Night Watch?
About the article "The Night Watch", section "Acts of vandalism".

Candidate passages:
As a utility tool the knife can take many forms, including: Balisong: A folding knife also known as a "butterfly knife" or ""batangas"", with two handles counter-rotating around the tang such that, when closed, the blade is hidden within the handles.
Bowie knife: Commonly, any large sheath knife, or a specific style of large knife popularized by Jim Bowie.
Crooked knife:sometimes referred to as a "curved knife", "carving knife" or in the Algonquian language the "mocotaugan" is a utilitarian knife used for carving.
Diver's knife: A knife adapted for use in diving and water sports and a necessary part of standard diving dress.
Electrician's knife: A short-bladed knife used to cut electrical insulation.
Hunting knife: A knife used to dress large game.
Kiridashi: A small Japanese knife having a chisel grind and a sharp point, used as a general-purpose utility knife.
Linoleum knife: is a small knife that has a short, stiff blade with a curved point and a handle and is used to cut linoleum or other sheet materials.
Machete: A large heavy knife used to cut through thick vegetation such as sugar cane or jungle undergrowth; it may be used as an offensive weapon.
Palette knife: A knife, or frosting spatula, lacking a cutting edge, used by artists for tasks such as mixing and applying paint and in cooking for spreading icing.
Paper knife: Or a "letter opener" it is a knife made of metal or plastic, used for opening mail.
Pocket knife: a folding knife designed to be carried in a pants pocket.
Subtypes include:  * Lockback knife: a folding knife with a mechanism that locks the blade into the open position, preventing accidental closure while in use  * Multi-tool and Swiss Army knife, which combine a folding knife blade with other tools and implements, such as pliers, scissors, or screwdrivers Produce knife: A knife with a rectangular profile and a blunt front edge used by grocers to cut produce.
Rigging knife: A knife used to cut rigging in sailing vessels.
Scalpel: A medical knife, used to perform surgery.
Straight razor: A reusable knife blade used for shaving hair.
Survival knife: A sturdy knife, sometimes with a hollow handle filled with survival equipment.
Switchblade: A knife with a folding blade that springs out of the grip when a button or lever on the grip is pressed.
Utility knife: A short knife with a replaceable triangular blade, used for cutting sheet materials including card stock, paperboard, and corrugated fiberboard Wood carving knife and whittling knives: Knives used to shape wood in the arts of wood carving and whittling, often with short, thin replaceable blades for better control.
X-Acto knife: A scalpel-like knife with a long handle and a replaceable pointed blade, used for precise, clean cutting in arts and crafts  
Cutting principles.
Knife cut principle.
The book cutting machine works with three knives and use the knife cut principle.
The knife cut principle operates with only one knife per edge which cuts against a rubber surface.
This surface supported the cut force.
The three-knife-trim is performed in one step.
The block is aligned and fixed by the pressure bar.
The three knives cut all edges but except the spine, new machines need only one step. 
 "This article refers to a type of table knife.
For other uses see, Case knife (disambiguation)."
A case knife is a name used throughout the American South to refer to a table knife, i.e.
a knife intended for use at the dining table.
The origin of this usage comes from a time when inns did not customarily provide eating utensils with meals.
The table fork was relatively new, and was often sold in combination with a knife and, sometimes, a spoon.
Thus the term refers to a knife that was sold in a case, as part of a set of utensils intended for use in dining.
Case knife is also used to refer to a pocketknife made by W. R. Case & Sons Cutlery Co.. 
It consists of a knife blade which is used to cut the web when the maximum roll diameter is reached.
The knife blade is actuated either by means of pneumatic or electrical actuators. 
 "De Nachtwacht", painted in 1642 by Rembrandt van Rijn, was vandalized for the first time at the Rijksmuseum Amsterdam.
A recently unemployed cook slashed through the 209 year old canvas with a knife.
On September 14, 1975, a retired schoolteacher cut through the 333 year old painting and tore off a section in the center, and on April 6, 1990, another vandal sprayed sulfuric acid on the now 358 year old masterpiece, which has been restored each time.
Born: Joh Bjelke-Petersen, Premier of Queensland (d. 2005)