Charles, Angus and Patrick had just broken out of prison. Knowing that the police were hot on their tails, they dashed into the nearest building they could find - an old pub. Worried that the police would arrive at any second, they headed into the basement to hide. In the basement they found three large burlap sacks, which they hastily climbed into in an attempt to conceal themselves.
A policeman walked into the pub and asked the old landlord if he had seen three men enter. The man pondered for a while, before pointing a wrinkled old finger to the door leading to the basement.
The policeman entered the basement to find the three sacks leaning against the wall. Curious, he kicked the first one, inside of which hid Charles. Thinking on his feet, Charles did his best impression of a dog. "Woof woof, woof woof" he barked.
The policeman frowned, but said nothing. He moved to the next bag, where Angus hid, and decided to kick it too. Following Charles' lead, Angus began to purr like a cat. Again, the policeman frowned, but said nothing.
Finally, he came to Patrick's bag, which he again kicked. Patrick, who had been trying desperately to understand the others' plan, smiled, and shouted, with as much conviction as he could muster "POTATOES!"