... "Got any quackers?"
The barman looked at the duck for a second, then said "No, Besides, you're a duck. It's a health code violation for you to be in here, so get out before I call animal control."
The duck leaves, but comes back the next day. Same situation: "Got any quackers?"
"Look you stupid feathered, I told you yesterday that I don't have any, and you need to leave. If you come back again, I'm going to nail your bill to the bar."
The duck comes back the next day and approaches the bartender.
Duck: "Got any nails?"
Barkeep: "Uh, no."
Duck: "Got any quackers?"
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