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 boxer Mike Tyson turning around and smiling. He looks kind of creepy with those glasses. The smile and nod makes it a great reaction gif for whenever you approve of something on the Internet.