They called Marty “Mister Smarty Pants.”
But it wasn’t his pants that was smart.
It was actually his underwear.
They were a strange hybrid of boxers and briefs, and when he wore them, he felt so much smarter.
Perhaps it was the way they held him there that led to increased confidence, and with that confidence came the appearance of greater intelligence?
You know, how glasses and a lab coat make people sound more authoritative?
Marty tried to wear those, too. And nothing else.
He got arrested for public indecency, despite his attempts to talk his way out of it.