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Even sticking to ABBA, "Waterloo!" is fewer bits and triggers an earworm just as well, but of course waterloo is not a man after midnight.

Part of the challenge is finding some plausible reason to have the string come up in the context of operating a Unix system.

Maybe Rihanna will come out with a song called "Grep". Heck, maybe the Black-Eyed Peas already did...