Mystery - Clue #1

It's a Mystery.
15 clues to solve it.
Winner* may write a guest post for From Sushi To Samurais, or have Sushiboy write a guest post on winner's blog (or both).


Clue #1
*Guest post subject to approval from Sushiboy. Don't post your guesses in the comments, send guesses to sushiboyemail@yahoo.com instead. Please only send one guess per day.

Dadguy, Bon, Nobody and Superwoman are, regretfully, unable to enter since they know the mystery. But each is still welcome to do a guest post if they wish.