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.
An animated gif of a snail using a rocket to fly off while the words "ABANDON THREAD" flash up on the screen. This is a perfect gif to use whenever you no longer want to be in a comment thread/online argument.