Dragon Ball Kai - episode 91 - 29 Jan, 2011

Full Power Super Saiyan Gohan shows no willingness to fight, and tries to convince Cell to end the Cell Games by explaining that if his hidden powers are brought to the surface, he will lose control and kill Cell. Counter to Gohan's intentions, this actually intrigues Cell, who decides to deliberately enrage Gohan by inflicting enough pain to force him to unleash his true strength. After watching Gohan take Cell's punishment, Android #16 intervenes. Taking advantage of the fact that he emits no detectable ki, #16 grabs Cell from behind and declares that he is going to trigger his self-destruct bomb. (Source: Wikipedia)