My Roommate is Awesome

Me: "You know, I've figured something out. You keep doing that 'went right over your head' gesture, and that's why you're going bald so early."

Him: "Yes, well, most things I say go over someone's head. And everything goes over your head, shorty."

Me: "That's okay. I'm allowed to let these things over my head - I have a doctor's note."

Then I said something about "learning by osmosis". Given that he was once thinking about being a chemistry major, I should've known better; instead, I wound up with a tennis ball thrown at my head (which happens surprisingly often).