"Did you know 'Lucy In The Sky With Diamonds' is about LSD? It's right there in the title." If some know-it-all ever says this to you at a party, you can gently put them right. It's not about LSD. It's about a painting done by John Lennon's son. So there.
'LITSWD' (as it's referred to by... no-one) isn't the only song that's frequently misinterpreted, or whose real meaning might have escaped you - no matter how many times you sing it at karaoke, blissfully unaware that you're singing about an evil super-rat, or a sex position, or a vampire love story (these are all genuine examples of songs in this gallery).
Here's 11 more.