Because they don't know the words.
When there is no "L" ("Noel")
No one can ever know P.S. are these type of tongue twister jokes allowed here If not i will happily remove it.
He shreds.
Neither of them are a clarinet!
Me: Words Him: Can you say more Me: More Him: Me: I'm also good at directions
A: "Nobody's perfect!"
Because they can't remember the lyrics