INFP's in my experience are pretty amazing at being really, really funny and at the same time, doing it gently. That's not to say toothlessly - the teeth are shown, but not used. As much as to say "I made that observation, yeah, don't think I didn't. Don't worry, your secret's safe with me... or is it? Heh, no, it is. Or is it? Nah, really, it's cool. Or is it?" etc.
They're crazy and stuff like ENFP's, but just more kinda... controlled. ENFP might get wild and out of control a bit, and end up causing offence through just being carried away.