The trick goes like this: you are sent an e-mail or instant message with a link to something seemingly cool. But when you click, all you get is singer Rick Astley's 1987 video for "Never Gonna Give You Up." Huh? The bait and switch originated on the online forum 4Chan, when a user promised a video-game trailer and instead led readers to Astley's '80s-tastic track. The trick, dubbed Rickrolling, spread like wildfire in 2008; Astley, clearly in on the joke, even performed his signature song during the Macy's Thanksgiving Day Parade that year.