Well, in my youth, I used to sometimes play little tricks on people. The fun was in the thinking about the WTF moment. I am not saying that these pranks were a good idea but they still make me laugh.
Some highlights:
While living at home, I took the thanksgiving turkey that work had given me and placed it in the backyard patio grill of our next door neighbor and left it there all winter. Next spring WTF!
While sitting at my bosses desk, I randomly punched a bunch of buttons on his phone. I later heard someone from accounting remark “I do not no what is going on in F&B, but when you dial the in house extension the call gets forwarded to the dining room managers home answering machine.” Causing both the F&B manager and the dining room manager to say WTF.
Someone had left a bag off Cecil B. DeMented promotional magnets lying around. Must have been a hundred of them. We stuck them all over someone’s car.
Once some friends and I were walking by the train tracks. We found this dead dog, it had apparently been hit by a train. We picked it up with shovels and…This one we never did, but we talked about putting it in a parked car.
I, of course, am ashamed of my misspent youth.