I guess the word to adhere to is “Appropriate.” We can all think of pranks that would be totally unacceptable for your place of work, whether it’s an office or not. So let’s not go there.
One fun prank that works, but doesn’t hurt your co-workers, is the “fake cast.” It’s great if you like to hike, bike, bowl, or play some sort of team sport, etc. because the cast and your explanation will be very believable. If April Fool’s Day is in the middle of the week you’ll have to dream up some accident other than the weekend recreation scenario. Be creative.
Now, the night before, wrap your knee with stretch gauze and secure it. Then apply some plaster of Paris and let it harden. Don’t forget to cut a slit in the back for easy on-and-off access to your knee the day of the prank. Reserve some fresh gauze to cover the slit in the cast the day you wear it. A cane is a must if you don’t have some old crutches somewhere around the house. You have to look the part.
“Oh, Bob. What happened to you?” you’ll hear as soon as you hobble into the office. “Well, I was …” and regale them with a really sad expression on your face & shocking tale! Ask someone to please get you a cup of coffee and bring it to your desk. Play it up outrageously and see how long it takes for someone to catch on. It’ll be fun – I know because I’ve already tried it!