What are the best and original pranks you've ever done or witnessed?

I've done many pranks I will tell 3 of them

1 Throwing water balloon or eraser that is full of chalk at the stair
2 Pouring water on people who are in the toilet
3 pulling someone's pants down in front of the girls

those are so gay. u can do way better than that.

I once stabbed a hobo in the eye with a switchblade.
That was freaking funny, laughed for weeks.

one time i kept doing the could of had a v8 thing to my sister and she said she'd get her revenge. i disregarded it cause she never does anything, but at 8 in the morning i woke up cause i felt water on my chest. as it turns out she was trying to give me a temporary Edward tatoo in my sleep. I hate her.