A March Starter

A duck walks in a bar and asks, "Got any grapes?"
The bartender replies, "We don't sell grapes."
The duck leaves but returns later and asks, "Got any grapes?"
The bartender replies, "I told you we don't sell grapes and if you come back here anymore asking for grapes, I'll nail your webbed feet to the floor."
The duck leaves but returns again later and asks, "Got any nails?"
"No," replied the bartender.
"Got any grapes?" the duck asks.