In The Princess Bride, Westley and Buttercup entered the Fire Swamp. Buttercup asked how they would survive the R. O. U. S.'s. Westley answered, "Rodents Of Unusual Size? I don't think they exist". Just then, a rodent attacked Westley, who defeated and killed the rodent after a bloody battle. Everyone will know that Rodents Of Unusual Size are real when you wear this They Do Exist Princess Bride t-shirt!