Scoring - any fun ideas?

Have begun to play once a month with my son and was wondering if anyone had any fun ways of scoring that could make it a bit more intersting for my lad.

Perhaps you could play matchplay and he could give you a 3 hole headstart

Try 2 mulligans per 9, no carry overs to the back for unused on the front.  That'll make him pick and choose which of his bad ones he wants to can. 

Also, he can make you swap balls with him once every three holes, but not on the green.  That'll give you some practice from the nasty stuff too!