Sharon Stone is being interrogated by cops, including Michael Douglas, when she throws all the men off their game by uncrossing, and then recrossing her legs, revealing the underwear that she doesn’t have on.
The interrogation scene from Basic Instinct is one of the most famous in modern movie history.
However, the truth behind the way the scene was shot changes the situation quite a bit.
In the shot, the men mostly become slobbering idiots trying to get a good look, but the truth is they didn’t see anything, because they weren’t in the room.