I knew a camp counselor who loved to do things like this all the time. She was like an aunt to me, lol, I knew her outside of camp too, but that's when most of her joking went on. She filled showers full of balloons to the point where you had to pop a couple to get them out. Duct tape rolled sticky side out stuck in people's sleeping bags. Alarm clocks set for the middle of the night and hidden somewhere in the room. Fishing line attached from the zipper pull of a sleeping bag to something else. I can't recall everything at the moment but some of them were so clever... she was a master at practical jokes and we all knew it. I really wish I could remember more, and if I do, I'll post again, lol.
Well, one summer they decided to get her back. We were at breakfast the last day of camp and they decided to sneak up on her and suddenly duct taped her to the chair she was sitting in. Then they put a video in the small tv in the dining room... we all assumed it was the "camp video" that they had been making all week long with little snippets that got caught on camera, it was tradition to do it that morning. Instead, suddenly I hear from her, "HEY! THAT'S MY HOUSE!" and indeed it was! The video showed that some of them had went back to her house and stuck hundreds of plastic forks into her front yard. It spelled "GOT YA!" lol XD