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 a strange animated gif of Lady Gaga with Jim Carrey's face after being photoshopped onto her. This is often used as a reaction gif whenever somebody is wanting to express their delight / excitement.