A duck walks into a shop.
Duck: "Got any bread?"
Clerk: "No."
Duck: "Got any bread?"
Clerk: "No."
Duck: "Got any bread?"
Clerk: "No."
Duck: "Got any bread?"
Clerk: "No. Ask me again and I'll nail your beak to the floor."
Duck: "Got any nails?"
Clerk: "No."
Duck: "Got any bread?"
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Dave