Coming out of the closet will induce hysterics - Shanta Danielle Arul

If you're ever thinking of pranking a neighbour, hiding in her closet and jumping out suddenly will guarantee a good scream, about 15 minutes of side-cramping laughter and retaliation in the not-so-distant future.
It also involves 20 minutes of sweltering in a stuffy cupboard and the need for an accomplice who is both poker faced and indubitably trusted by the victim (thanks Audrey :D).