At North Royalton, the Special Ed department would go around with some of their students to refill the pop machines.  It gave the students a way to feel like they were contributing and helped them with practical skills.

One day, as I was leaving cafeteria duty, one of the differently-tarded students hailed me.

“Mr. Nestoff, do you want to hear a joke?”

He was given a joke book for his birthday, and was pretty happy about it.

“I really do.  Tell me a joke.”

“What do you call a sick pig?”

I should be able to get this, but I was stumped.

The punchline