1. All my clothes would finally match.
2. I wouldn't need to worry about money. Ninja do not need day jobs.
3. I could sleep with a sword and no one would think it was weird.
4. I would be impervious to bullets. Or I could at least dodge them.
5. The law would be unable to touch me.
6. My battle-cry would rock.
7. My chosen profession would finally warrant an action figure (with kung-fu grip!)
8. I could walk into a room and see 10 ways to kill you before you could beg for your life.
9. I would finally have the excuse I've always needed to purchase a grappling hook.
10. It would no longer matter whether I was invited to parties or not: I could sneak in, jump into the middle of the room, and commit sepuku on the spot, thus insuring that the host would never again forget to invite me.