The Doctor also regularly intimidates whole alien galactic empires and eldritch abominatios from beyond space and time. By just standing there, talking. And pointing out he's doing so without having a single weapon on him. Tennant was great at that.

“Don't play games with me. You just killed someone I liked. That is not a safe place to stand. I'm the Doctor! You're in the biggest library in the universe. Look me up.”