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 an animated gif of actor George Clooney shouting "Everybody be cool. You. Be cool!" while he is pointing a gun around. This is from the 1996 movie "From Dusk Till Dawn", where Clooney played the character Seth Gecko.