I’m a high-school geometry teacher, and I started one lesson on triangles by reading a theorem. “If an angle is an exterior angle of a triangle, then its measure is greater than the measure of either of its corresponding remote interior angles.”

I noticed that one student wasn’t taking notes and asked him why.

“Well,” he replied sincerely, “I’m waiting until you start speaking English.”

One Liner
I’ve learned that a smile is an inexpensive way to improve your looks.