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 animated gif of Batman standing behind a tree before giving a thumbs up. This is from the cartoon that run throughout the 90s. This can be used whenever somebody says or does something that you approve of.