Hmm....
I've always been a prankster, but the funniest one I can remember was at my first house....
It was late night winter, so the house was especially dark, and I was especially bored. I sat for a while, before finally deciding that I needed to prank someone; my mother, sister, father, ANYONE, but it just had to be done.
So, with the way, our furniture was arranged, there was a little niche where a kid could fit, and be unseen, and that I used to my advantage. There I sat lying in wait, until the first creak on the stairs leading to the room were heard. I sait there in silent anticipation, and just when they had made it to the end of the stairs maybe 5ft from my hiding spot, I popped up! All I said was "boo" but it sent my older sister running through the house, back into a more well lit area of the house.
I died laughing.
x' D