The anthropologists of 5,000 years from now are going to have a hell of a time piecing it all together:
Q: What is Rick Roll, Rick Rolling, Rick Rolled?
A: An internet prank or joke. Rick Roll, Rick Roll’d or Rick Rolling is an internet spam trick in which people post a link to a Rick Astley video on Youtube, but say the viewers of the video are being led to another video, usually proof of unconfirmed gaming news or trailers. (courtesy of Yahoo! Answers)
Rick Rollings tend to dump you hereabouts — one of the several “Never Gonna Give You Up” videos with far more viewings than they deserve: