http://mindhacks.com/2010/02/11/the-burglar-with-the-lemon-juice-disguise/It is a 10 years old news, but it so funny that I post it anyway in the case somebody does not know it.
In 1995, McArthur Wheeler walked into two Pittsburgh banks and robbed them in broad daylight, with no visible attempt at disguise. He was arrested later that night, less than an hour after videotapes of him taken from surveillance cameras were broadcast on the 11 o’clock news. When police later showed him the surveillance tapes, Mr. Wheeler stared in incredulity. “But I wore the juice” he mumbled. Apparently, Mr. Wheeler was under the impression that rubbing one’s face with lemon juice rendered it invisible to videotape cameras (Fuocco, 1996).
After all you can use lemon to make invisible ink, so it is perfectly obvious it makes you invisible too.
