The title for the sequel already has us debating all the different things it could mean. A "glass onion" can be slang for a monocle, and one of those appears in the name announcement trailer. "Glass Onion" is also the title of a famously mysterious Beatles song whose lyrics have been debated for decades.

The Beatles' "Glass Onion" Lyrics

I told you about strawberry fields
You know the place where nothing is real
Well here's another place you can go
Where everything flows

Looking through the bent-backed tulips
To see how the other half live
Looking through a glass onion

I told you about the walrus and me, man
You know we're as close as can be, man
Well here's another clue for you all
The walrus was Paul

Standing on the cast iron shore, yeah
Lady Madonna [1] trying to make ends meet, yeah
Looking through the glass onion

Oh yeah, oh yeah, oh yeah
Looking through the glass onion

I told you about the fool on the hill
I tell you man he's living there still
Well here's another place you can be
Listen to me

Fixing a hole in the ocean
Trying to make a dove-tail joint, yeah
Looking through a glass onion.