An extrovert mathematician will be looking at the other guy's shoes.
Me: fruit salad H: That's funny, it looks like a sangria. Me: huh, weird *sips fruit salad*
They have no one to look up to.
They have already told everybody about 6 times in 5 minutes
Cacawatches
The extroverted mathematician looks at YOUR shoes when he's speaking to you.
The extrovert looks at the other person's shoes.
When talking to you, the extrovert mathematician looks at *your* shoes.