Christian's with fiery coals- look out!

I was reading through Romans the other day and stumbled upon the passage where Paul cites a Proverb (25:21-22)

If your enemy is hungry, feed him. If he is thirsty, give him something to drink. For in doing so you will be heaping fiery coals on his head.

Isn't it great (and a little comical) that God knows the temper of his creation so well that he knows how satisfying it would be to heap fiery coals on the head of someone who has made us mad : ).