Oh wow! I did this like 4 years ago! The girl I did it to was like, "HEEEEY!!!" It was awesome. Another prank I pulled was this one kid went to the bathroom and saw some change in the urinal. After he told me about it, I went to the bathroom and counted the change in the urinal. I matched my pocket change to it, ran my hand under the faucet and went back to the kid and slapped him hi-five. I left the wet money in his hand and he just looked at me with this cold stare of complete disbelief. ;)

Oh yes, I'm a prankster at heart.