Gif Central boasts hundreds of funny animated gifs. Only the best of the best make it onto this site, with most of them having an accompanying source. No tumblr-esque one-second-long disappointments. No obscure titles or descriptions.
This is animated gif of Russell Crowe shouting "Are you not entertained?" in a scene from the movie Gladiator (2000). Obviously a great reaction for whenever people are shocked/disturbed/taken-aback by what you've said or done.