Damn, with a band like The Cure you'd almost have to specify which decade. If I had to pick one song I'd go with Love Song. But their old stuff is good too. Killing an Arab, Boys Don't Cry, 10:15 on a Saturday Night, Hanging Gardens, jeez, they're all good.
<--off to go listen to some old school Cure. Maybe Carnage Visors.
kev