MATHEMATICIAN: (after handing the curt waitress who didn't crack a smile all evening his credit card) I don't think she likes us.
ME: I don't think she likes waitressing.
The Mathematician nods contemplatively.
ME: It's cool. Sometimes I like it when people are bitchy to me. It means I don't need worry about being nice to them, which sometimes makes things more efficient.
The Mathematician nods. Efficiency is something he can certainly appreciate.