Las Ketchup were a Spanish pop group who broke out with their song "Aserejé (The Ketchup Song)." They came out with a Spanish version, a Spanglish version, and one with Portuguese verses. There was even a choreographed dance that people learned. The song was addictive, but it's also weird, and that's OK. (And if you must know, I did have the dance memorized.)

Listen to the song here.