Honestly, this is the only time Gohan seemed so badass.
Android 16 told Gohan that it was okay to fight sometimes to defend their loved ones, and to protect the world he loved. Perfect Cell, overhearing this promptly crushed Android 16's head beneath his foot. This was the moment when Gohan finally snapped and attained a new level, Super Saiyan 2 (and went on to kick Perfect cell's arse. Yay!)