Rick Rolled?

I was visiting one of my favorite photographer message board and someone had a Youtube link to story he had shot. He loved it and wanted to know what we thought. The link led to the above video, supposedly we got "Rick Rolled." I guess it's the new fun web prank, you tell someone about something cool on Youtube and when you get there, you get Rick Astley. I can't figure out why this is funny. The video on Youtube has over 7 million hits, so there has to be a lot of people doing this. Maybe I'm out of touch, maybe it's actually because I remember when the song was a hit. To me this is on the level of chain letters, bad photoshoped pictures and guys saying "pull my finger." Please explain to me why this is funny? It's a fair song with a crappy 80s video. Wouldn't Flock of Seagulls I Ran be better how about Men Without Hats Safety Dance and my personal choice Snap! I Got The Power. You can be Snapped or Got Powered. This is getting kind of hectic and if I get Rick Rolled again or I will attack you don't want that.

Update; the above video is not working, I guess the Rick Roll people want you to ask for permission to embed the video. How about no, if you want go watch it, I just don't want to encourage them any more than I have to.