Originally posted by: Sooks
I'm not saying you can summon Kyuubi out of Naruto's body, I'm saying before the 4th sealed him someone had to have summoned him.
I'd assume if the summoner is able to defeat Kyuubi, the Kyuubi would be loyal (kind of like Orochimaru's snake) but if not, then he'd have some fun which could have been destroying Konohoa. Just like how when Naruto first summoned Gamabunta, Gamabunta remarked about how long its been since hes been out and he would take this bit of time to enjoy himself.
Also Kyuubi probably would make a contract with a huamn, because if he didn't, the Kyuubi would never get a chance to kill anyone.