"By the power of Grayskull,
I.. Am.. The.. Power!!!"
He-Man (He-Man and the Masters of the Universe).
[Was always going to quote this, and there is a photo somewhere with Will (about 7 or 8) striking the pose, but was prompted by the very funny advert currently running, which has Skeletor disco-dancing down the street to the theme from Fame. Hilarious, and absolutely certain that Will would have loved it, and laughed himself silly].