During summer, I'll try to tell one riddle per day (but... maybe it will be less, honestly), using Server Message in the game. Don't know how it will turn out, which is what is exciting ! Each time a random reward will be delivered. The riddles will probably be like : Find out where to go, and get the reward there.
I'll tell the answer here if the reward is found OR after 12 hours.
Today's one (Sunday, 27th of June 2010) :
Where the Big and the Little are living, look at the Big one, and find out who was his clone,
Then search the building at the south of which the clone's daughter lives in.
There, you will find a Combat Armor !
Solution
Little and Big Jesus Mordino, then Vic that has same skin as Big Jesus, then Vic's daughter in Vault City. Found by TTTLAs, congratulations to them !