A bloke walks into a pub with a meat and potato pie balanced on his head.

He walks up to the barman and says, "Can I have a pint of bitter, please."

"Certainly," says the barman, and starts pulling a pint. But he can't resist asking: "You do know you have a meat and potato pie on your head?"

The bloke says: "Yes, I always have a meat and potato pie on my head on a Wednesday."

"Ah!" says the barman. "But today it's Tuesday!"

"Oh no," says the bloke. "I must look like a right twat."