Search for Astley’s name on YouTube and you’ll find dozens of instances of the campy, infectious video, which features a heavily coiffed Astley bobbing and swaying behind oversized sunglasses. He’s flanked by two blond backup dancers (one of whom apparently didn’t have the footwork down), and a male bartender in short shorts who excels at spontaneous back flips.

Rickrolling is an example of an Internet “meme” (defined by Wikipedia as “any unit of cultural information ... that gets transmitted verbally or by repeated action from one mind to another"). Its less sophisticated memetic forebear is the “duckroll,” where the roll-ee is misdirected to an image of a duck on wheels. And the Rickroll has sired many memelets, including the Fresh Prince roll, the rainroll (plopping you in front of a video of Tay Zonday’s "Chocolate Rain") and even the Reichroll, where Astley’s song is spliced with footage of Adolf Hitler for an unsettling sort of lip sync.

With all the online momentum it’s gathered, the Rickroll has now trundled its way into the real world, too. The spectacle of trench-coated pranksters blaring the song into unsuspecting crowds has become a symbol of harmless, geeky rebellion. As the blog LAist.com noted last week, and the New York Times reported Tuesday, a recent basketball game at Eastern Washington University was interrupted by a dancing Astley imitator, and there’s now a small YouTube library of the anti-Scientology group “Anonymous” Rickrolling different church locations.

For his part, Astley was nothing if not modest about his new cultural role. “If this had happened around some kind of rock song, with a lyric that really meant something -- a Bruce Springsteen, "God bless America" ... or an anti-something kind of song, I could kind of understand that,” Astley said. “But for something as, and I don’t mean to belittle it, because I still think it’s a great pop song, but it’s a pop song; do you know what I mean? It doesn’t have any kind of weight behind it, as such. But maybe that’s the irony of it."