You might try to alternate between the various responses to show your diversity. On the other hand, it never hurts to fall back on an old standby. If a joke is funny once, it stands to reason that it will be funny twenty more times. Situation Joke Somebody is very tall. Oh sorry, I thought you were a lightpost.
Somebody is very short.
Somebody hurts himself. That's going to leave a mark. You're going to feel that tomorrow. Somebody says something untrue. Bzzt, wrong answer.