Pork pie

A man walks into a bar with a pork pie sellotaped to his head...
Barman: "Excuse me, why have you got a pork pie sellotaped to your head?"
Man: "I do this every Tuesday!"
Barman: "But it's Thursday today!"
Man:
Barman: "Excuse me, why have you got a pork pie sellotaped to your head?"
Man: "I do this every Tuesday!"
Barman: "But it's Thursday today!"
Man:
Spoiler: