All the good ones are already taken, and the available ones are either pay or handicapped.
Pay him
Because education pays off in the long run!
If you let the dog in, it will shut up.
Because for years men have telling them that ---------------- is 8 inches long.
I've never heard any good ones so please give me your best!
Because all the good ones Argon.
Handicaps
Because it would be really awkward asking what their handicap was.