Don't Scratch Your Balls If You Write on a Chalk Board

My astronomy professor is a great guy. He's really smart, and a great teacher, but I think all the years of research have made him a little absent minded.

He writes a lot of things on our blackbaord, but never uses an eraser. Instead he wipes everything off with his hands, which would be fine, if he didn't decide to scratch his balls in the middle of class.

Dusty hands+ ball scratching= funny situation.

Seriously you try paying attention to the formation of double lobed galaxies when the guy explaining it to you has chalk all over his crotch.

Good times.