In the car on the way home from church...
Me: C, did you have fun in the nursery today?
C: Yes.
[pause]
C: Christy (name has been changed) threw toys.
Me: Oh, that's too bad. What happened next?
C: I got hurt. Christy is very very very bad.
Me: C, people aren't bad; they sometimes do bad things, but you shouldn't call them "bad."
[pause while the wheels turn]
C: Christy threw badly.

The joys of language acquisition!