That's hilarious! Oh man, sibling pranks are my favorite. I come from a family with six kids, so I, being the oldest, had 5 younger siblings to torture. But we all got each other good one time or another. One of my favorite pranks was when my youngest sister hid at the foot of my baby brother's bed (she was 14 and he was 9 at the time), underneath his pile of plush animals and blankets, and when he got into bed, he was laying there for a good few minutes before she just says "HELLO JOSEPH" in a creepy low voice. He screamed like a girl and then fell off the top bunk where he was. Nothing was broken, besides his pride, but we still laugh about that one.