A cat is snoozing on a bar, and a couple of Mexicans are boasting about how macho they are. One of them says "My cock is longer than that cat's tail." At length, so to speak, the bartender is persuaded to find a ruler & measure the cat's tail while the customer drops his pants. He then proceeds to the customer, who protests: "Just one moment. Where did you measure the cat's tail *from*?" "From the asshole." "Kindly do me the same favor."