Mission Impossible - Ethan Can Fly
In the scene when Ethan breaks into the CIA HQ, you can see a shot of his head and upper-body coming straight down through the ceiling. This is impossible because you then see the other agent lowering him down into the vault. The rope is let down over a pulley on the edge of the vent, so when Ethan's head is coming through the vent, the pulley that is holding him is at the same hight as his shoulders.
The movie, some logic
on 03-10-2001 and