The Duck and the Lemons

A duck walks into a bar and asks the bartender, "Do you have lemons?"
The bartender says, "No, we don't have lemons!" Disappointed the duck leaves.

Ten minutes later he comes back and asks the bartender, "Do you have lemons?" Slightly annoyed, the bartender says, "For the second time, no we don't have lemons!"

The duck turns around and leaves, only to return ten minutes later and once again asks the bar keep, "Do you have lemons?"

The bartender is pissed, " If you come in here one more time and ask if I have lemons, I will get my hammer and nail your little webbed feet to the damn floor!" The duck flies out of the bar quacking in fear.

Ten minutes later, the duck walks in, the bartender in astonishment listens as the duck asks, "Do you have nails?"

Confused, the bartender says, "No." The duck replies, "Good, do you have lemons?"