Three girls robbed a bank. One was a blonde, one was a redhead, and the other was a brunette.
They were walking idly down the street, talking about how many sandwiches they'd be able to buy next time they went to Arby's, when they heard sirens. Fearing that they would get arrested, they ran into a nearby thrift store, which, gratefully, was empty.
As the cop cars parked outside, the girls realized that they were going to have to make themselves scarce. The redhead hid herself beneath a table with a long, flowing tablecloth. The brunette placed herself in an ancient wardrobe. The blonde hid in a potato bag. By the time the policeman entered, the shop appeared to be empty once more.
"I know you're in here," he called, cautiously making his way through the shop. He knelt before the table and began to lift the tablecloth. But as he did so, a soft 'meow' reached his ears. "Oh," he breathed. "Just a cat."
He proceeded to the the wardrobe. But just as he began to open it's creaking door, he heard a quiet 'woof'. "Oh," he whispered. "Just a dog."
Finally, he went to check the potato bag. But just as he started to open it, the blonde said, "Potato."