That's always fun to find your student's funny bones, it's a good way to help them learn. I found that some of my most memorable learning moments were tied to laughter.
I also had a computer teacher in college years ago that was trying to tell the class about things that bothered him and instead of saying pet peeve he said pet pea.
Again, I lost it and had to excuse myself from the class. He explained to me later that that was the way they said it where he came from. I apologized, but he said there was no need.