I’ll relate a true story you may be able to incorporate into a high school or after school setting. A steel worker friend of mine was starting on a new job site. He didn’t know anyone and saw a foreman standing in the middle of a circle of men.
As he approached he heard the very large steel worker foreman telling a joke. Well, the large steel worker was telling the joke with a lisp. My friend arrived just in time for the laughter. He said, “I missed that one, but have you heard this one.” And he proceeded to tell a joke about a man with a lisp. Welllll…everyone around him moved away and kept giving my friend weird looks. It turns out the steel worker telling the first joke, actually had a lisp. He laughed at the joke and it took about an hour for my friend to realize the guy actually had a speech impediment.