To be given a link to a cool video on youtube only to find that the link actually takes you to the video for Rick Astley's "Never Gonna Give You Up". A popular practical joke on message boards such as Gamefaqs.
Guy 1: There's a new trailer out for the Simpsons movie! Click here!
Guy 2: Hell Yeah! (clicks link)
Video: We're no strangers to loooovvvvvee
Guy 2: Dammit! I've been rickroll'd!