Got any fruits?

A duck walks into a bar and asks, "Got any fruits?"

The bartender, confused, tells the duck no. The duck thanks him and leaves.

The next day, the duck returns and asks, "Got any fruits?"

Again, the bartender tells him, "No -- the bar does not serve fruits, has never served fruits and, furthermore, will never serve fruits." The duck thanks him and leaves.

The next day, the duck returns, but before he can say anything, the bartender yells, "Listen, duck! This is a bar! We do not serve fruits! If you ask for fruits again, I will nail your stupid duck beak to the bar!"

The duck is silent for a moment, and then asks, "Got any nails?"

Confused, the bartender says no.

"Good!" says the duck. "Got any fruits?"

(P.S.. If you don't understand, please read it again and again.)