It's called "Rickrolling" when people get others to unknowingly open a link to Rick Astly doing that song. People usually do it by putting the link in a serious post. My brother got me good once when I had logged on to my MySpace page on his computer, and forgot to log off when I left. He posted that song as my page's music.

The only problem with Rickrolling in the Mudcat is that hardly anyone opens any links here.