Annoying Orc

A drunk orc walks into a bar. "Do you have any ketchup?" he asks the barman.

"It's a bar, we serve drinks," the landlord replies.

"Thanks," says the orc. He leaves and returns an hour later.

"Do you have any ketchup?" the orc asks.

"Look, I told you already. This is a bar and we serve drinks," says the landlord getting annoyed.

"Thanks," says the orc and leaves.

You guessed it, the orc is soon back. "Got any ketchup?" he asks.

"It's a bar!" says the landlord. "If you ask for ketchup again I'm going to nail you to the wall."

The orc thinks a moment. "Do you have any nails?"

The landlord shakes his head, "No!"

"Good. Do you have any ketchup?"