The Matrix: Mirrored doorknob: There was no way to properly hide the camera, so the director of photography threw a coat onto himself with a tie matching the one Morpheus was wearing, trying to blend in as much as possible

Guess it worked, I never saw it!

@stux Arrgghhh, I used to be a part-time sound guy and this takes me back to the nightmares I used to have the night before every shoot about people shouting "mic in shot"