Iron Man 2 - Man in Mirror
At about 28 or 29 minutes into Ironman 2; Tony goes to the bathroom to check his blood toxicity levels. If you watch his reflection as well as his actual person, they don't sync together.( Especially when Tony puts his finger in his mouth. The reflection is a second faster than the actual person.) I realize that if it was a mirror, you would see the crew and cameras.
DVD or bluray of the movie