Sometimes it is very difficult to play a trick on the colleagues as they are usually people whom you do not know well enough, or their higher rank does not allow you to play an unwary trick. There is one very simple joke, which you can play on your colleagues. You can be sure that it won't offend them and that is why you'll probably have no problems.

You can offer a simple game for your colleagues and the prize can be, for example, bear or wine, or chocolate. So, you tell the player the following rules:

I say "one, two, and three", you repeat "three" and keep silence for a minute. The person understands that there is something strange (why the rules are so easy?) and says something like "You should promise that you won't tickle or make me laugh". You agree, of course, to make him confident. And the game starts.

You say "one, two, and three".
He repeats "three".
You say "oh! I'm sorry, but you've lost the game!"
He becomes indignant and starts resenting "how can I lose