I generally don't like pranks, because when I was younger (like, grade school etc) I was very trusting of adults and my peers...many of them abused that trust for cheap laughs at my expense...only thing was, they only sometimes would tell me it was a joke...
The rest of the time I'd believe it--I was stupid, I smelled funny, I'm a scaredy-cat, etc. And when I didn't "get" the joke, that was because I "had a problem" or I "was being an ass about it."
Please, if you like pranks, and do them, be sure to not do them on kids or other people who are trusting.
And yes, I do have to ask this. Many people who like doing pranks have some degree of cruelty built into their Being...that's why they like pranks.