When the Saints Go

When Lenny drops the meatball on the floor as he is seated on the bench, a big splatter of tomato sauce ends up on the floor where the meatball hits. Lenny then pushes the meatball towards the wall under the bench with his boot, but the large blob of tomato sauce is still there. In the next shot as Zoey sits down, the tomato sauce is nowhere in sight. Lenny's feet are pulled pretty far back underneath him as he sits, so the splatter is not hidden by his shoes.

References This Is Spinal Tap (1984)