A website that you send your "friends" to, which will then cause them to be retargeted and they'll be shown Rick Astley video ads all over the internet.

Stolen/Borrowed from sharemywin on Hacker News (original link)

(To sharemywin: I tried to find your contact info but couldn't. If you find this and want me to take this down, lmk! Was too good not to repost. 😇)