One of those songs that's easy and fun to sing.
I told this story a few years back. The Poorhouse West was a jumping place during its heyday. I went there a lot. That song was one of the more popular jukebox selections.
There was a girl, a solidly built girl, probably close to 6 foot tall and built like a college linebacker. Every time that song was played she'd get up on the bar foot railing stand up straight and point to random guys in the place when the 'you're so vain' lyric came around.
It got people's attention.