Last one to post in this thread wins!

I had the pleasure of working with a painter, painting apartments. Another guy was replacing windows. The painter and I was caulking up seams. Somewhere along the line, I got the idea of caulking one of the windows shut, and the painter dared me to do it. It was a couple days before the guy got to that window. Try with all he could, he couldn't open that window. After about 30 minutes, he came outside and seen the window was caulked.

#1, he couldn't believe someone would caulk a window shut.
#2, he never figured out that I did it.