Whether you love him or hate him, most Mad Men fans will agree that Pete Campbell has some pretty epic facial expressions, especially when he's pissed off. But did you know that there's a tumblr dedicated to cataloging them? Check it out:
Pete Campbell's Bitchface
A few examples:
Pages of endless fun! And on a related note, while it might not really qualify as a bitchface, how awesome was the look on Pete's face during the last (amazing) episode when Peggy and Trudy came out of the bathroom together?