What are (embarrassing) songs you can't help singing along to?

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For me, I'd have to go with all the ABBA songs I know, the Singaporean National Day songs, certain BSB and Nsync songs as well as Britney's earlier songs. They may be embarrassing but they're oh-so-fun to sing along to! It's almost like a guilty pleasure~ Do you have such songs for yourself where it is pretty much a habit to burst into song whenever you hear them?