"Three Penguins" joke

Early one morning a stranger pulled up to the gas station in his convertible, and on the back seat were standing three penguins.

The cashier saw the peguins in the car, and when the man came in to pay she asked him what he was doing with the three penguins.

"I don't know what to do with them," said the man. "I've just been driving around with them in the back seat all week."

"Why don't you take them to the zoo?" said the cashier.

"Why, that's a great idea! I'll take them there right away!

A few days later, the same man pulls up in his convertible, and he still has those three penguins standing on his back seat!

"I thought you were going to take those penguins to the zoo," said the cashier.

"Oh, I did, and we had a great time. Today, we're going to the beach!"