Be very careful… Jokes and things done to make people feel better are not always about the intentions behind them. Even intending good, you may offend someone or make them feel violated. In this case, a surgeon was sued for giving a temporary tattoo. Kind of cute to some… deeply violated to others.
And the point is not to be careful just because you will get sued. No. Be careful, because you may leave someone feeling violated and you might get sued. Both.
Personally, I’d have trouble sleeping in either case.