u/Intellimancer

The one that brought the topic to mind for me was by Michael Nyqvist as Viggo in the original John Wick:

"Oh."

There was a lot behind that single word, and Nyqvist delivered it beautifully.

Surely there are other fantastic one-word lines out there - what are your favorites?

"Inconceivable!"?

"Groovy."?

"KHAAAAAANNNNNN!"?