you tape the handle down on the sprayer in the kitchen sink, and make sure it's pointing out. then the first person who uses the water gets sprayed. my little sister did this a long time ago back when we were kids, and i remember being very impressed. i'm pretty sure my parents even enjoyed it too. i did it a few years ago to my roommates, and they also thought it was pretty funny. because of this, i'm fairly certain that it's timeless and works for all ages.
also i have no idea who the lady in this picture is, but i had to use it just because i was able to find one on google of exactly what i was talking about.