Hamster Dance
The original dancing-hamster GIF wall — a companion site to the famous Hampster Dance meme.
Hamsterdance.com is one of two closely related domains (alongside Hampsterdance.com) hosting the same wall-of-dancing-hamsters format that went viral in 1998 — one of the earliest things to spread online the way we now call "going viral". Free, unchanged, exactly as absurd as it always was.