DEAD ASS HE LOOKED ME RIGHT IN THE EYE AS I TOOK THIS PICTURE
In Pulp Fiction, during the scene where Jules and Vincent are in the apartment, you can see that there are bullet holes in the wall behind them before any shots are even fired. Try not noticing that they next time you watch the movie!
At the end of the Michael J Fox movie Teen Wolf, there is a cheering crowd in the bleachers. You can clearly see a person stand up and their fly is all the way down! Then they suddenly try to cover themselves before they are off screen. Since you can only see them from the waist down, it was at first believed to be a guy doing it on purpose, but then it was discovered to be a girl, but who knows why her zipper was unzipped!