Wombat: Is it OK for me ever to say the F word?
Me: What??? No! Never say that.
Robert: And if you do say that you will get in trouble with me and then with Mommy
Wombat: But sometimes it's OK to say at the doctor.
*Robert and I look at each other*
Me: Wait..what do you think the F word IS?
Wombat: *blushes* "Frow up?"
*Robert and I burst into laughter*
Me: THROW up is not the F word, and you are allowed to say that at appropriate times.
Robert: Oh no, now we've opened up a whole can of worms...