"and sometimes he'd whistle I am the Walrus,"
The Walrus and the Carpenter
Public DomainThe Walrus and the Carpenter - Credit: John Tenniel

John Lennon wrote the 1967 song in response to a letter from a schoolchild at his former grammar school describing how his English teacher made the class analyse Beatles lyrics.  Lennon deliberately made the lyrics as nonsensical as possible.  The walrus is a reference to Lewis Carroll's poem The Walrus and the Carpenter, from his book Through the Looking Glass.

Listen on Spotify: Bono's version


I am he as you are he as you are me and we are all together. See how they run like pigs from a gun, see how they fly. I'm crying...

The full lyrics  

"The time has come," the Walrus said, "To talk of many things: Of shoes—and ships—and sealing-wax— Of cabbages—and kings

The full poem