I stole this from Die Hard: With A Vengeance (which is infinitely better than "Scrubs", whose answer is "one nickel and one quarter")...
While I was traveling to St. Ives, I met a man with seven wives. Each wive had seven cats. Each cat had seven sacks. Each sack had seven kittens. Each kitten had seven mice. Mice, kittens, sacks, cats, and wives, how many were going to St. Ives?