For as long as the World Wide Web has been in existence, the following adage has slithered its way into message boards, AIM away messages, and MySpace bios: “When you're happy, you enjoy the music but when you're sad, you understand the lyrics.”

Despite its innate, old-internet dubiousness — There's no way Frank Ocean actually said this — its message rings true. Just take a listen to feel-good classics like "Summer Nights," "I Saw Her Standing There," “99 Red Balloons," and all other the seemingly-joyous bangers that carry some dark messages.

From what "Walk This Way" is really about to the cheating scandal hidden with the "Macarena," here are 20 ultra-popular songs that are hiding super creepy lyrics.