I don't do "the look", because I think it's kinda childish... something that tells you are passive-aggressive, judging and arrogant.
"They did me wrong, and they should know it without me saying it out loud!"
Use words, they are much more powerful, and can settle any misunderstanding.
However, sometimes I make "The Stare", just to make people feel awkward. And I keep doing it until they start laughing. And I still keep doing it, until they become violent. That's the best part.