I Can Has Cheezburger is an ever growing collection of LOLcats pictures. These are pictures of mostly cats, but sometimes other animals, with captions to match the mood of the cat. The captions are usually done with purposely misspelled words and bad grammar.
LOLcats is something you need to see to appreciate, but be warned -- they are addictive and there are lots of them. If you decide to check them out expect to waste some quality time.