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 "trollface" doing the troll dance. This can be used whenever you've successfully baited somebody into becoming angry. It is NOT for when you pull stupid ass pranks on your friend.