These would be a closer guess.
This week has been full of zingers - too many to count. I come home, lock myself in my bathroom and laugh like a lunatic.
Because laughing in front of the students' faces would make them feel bad.
The best one this week so far:
Me: *makes a joke* What do you call a an ambulance for pigs?
*dramatic pause as all eyes stare at me*
Me: A HAMbulance! Hahahaha!
Student #1: I don't get it.
Student #2: Because HAM comes from pigs, dummy.
Student #1: REALLY? Miss, is that true? Ham comes from pigs??
Student #2: Where did you THINK ham comes from?
Student #1: I don't know, hamsters?