Cowardice Puns

I was at a restaurant with a friend and my girlfriend yesterday for an early dinner and we started discussing the difficulties of being a teacher. My friend then said "i just don't have the patience to be a teacher." I hesitated for a second, out of cowardice, but then replied with "teachers have students, not patients." There were lots of cringes. My girlfriend actually laughed and then said aloud that she hated herself for doing so. I think she's a keeper. :)