What line of a song is guaranteed to get other people singing?

1. "It's the final count down" will almost always get at least a "doo do doo do"
   — Geoff2f


2. SWEET CAROLINE
   — thenickman100


3. Wooooaaaahhh, we're halfway there...
   — Vinnicombe






4. “Somebody once told me...”
   — ellenrae96


5. Take me hoooome, countryyy rooooooads....
   — deandean1125


6. Don't stop Belieeeeeeving
   — DarthInsinuation






7. I get knocked down
   — Polarbear741


8. Happy Birthday to you!
   — smzt


9. His palms are sweaty, knees weak, arms are heavy
   — TheFeelsNinja






10. In West Philadelphia...
    — ProtectedCesc


11. “Do you like piña coladas?” Never fails
    — PsychoticFunk


12. WAKE ME UP
    — repeat-