They are looking at your shoes, rather than their own.
Nobody at the ticket counter knows what "north career" means
Everyone knows a Mercedes Bends!
It all depends on how you look at it
Oh look! A heard of elephants.
He wanted their soles.
You don't have to take your shoes off to jump on a banjo.
When talking to you, the extrovert mathematician looks at *your* shoes.
So he could look at others' faces.
