Not a joke, per se, but I overheard this father-son conversation in the Minneapolis airport as they were walking past:
"What state are we in, Dad?"
"We're in Minnesota."
"I've never heard of it. Is it famous for something?"
"Well, they're known for their really tiny sodas."
I groaned. My wife groaned. Four other people sitting around us groaned.
You're welcome, Traveling Minnesota Dad. Well earned.