I Do Some Dumb Things
One time, at work, I was on a really long boring conference call. I had this suction cup thingy from a wall mounted whiteboard or something and I started absent mindedly sticking it to things and then pulling it off to hear it pop. Well, sticking it to your forehead is not a good idea. Gave myself a hickey and had to walk around the office with a big red mark on my forehead. (It doesn't help when people are coming over, pointing and laughing either). :-)