Product review (5 stars): Slider Blocker!
This nifty filler/extender piece fits snugly between my counter top and my stove top.  Purchased it after helplessly watching a cooked piece of macaroni s-l-i-d-e down the little gap between the stove and counter into oblivion.  I'm not one to pull out my stove to clean behind/under, so preventing the mess in the first place makes sense.