You ride your scooter through the dirt while carrying a sheep because you're determined to attain something. Greatness? Glory? Everlasting fame? Maybe you'll attain a plural combination of all those things. After all, you are the best sheep-carrying off-road scooterist the world has ever seen.

After you attain that plural combination of glory, greatness, and fame, you get a tattoo (たつ) to celebrate: "world's greatest," in gothic lettering, above a picture of you and your sheep on your scooter.