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.
Use this "Place Fist Here" gif whenever you want to let somebody online know that they're cool. Not sure who the guy is with the "Pow!" ring. SOURCE EDIT: As a commentator pointed out, this is Stan Lee.