When Evil-Lyn and her mercenaries localize the Key, which is in Kevin's hands just before Lubic confiscates it, Kevin is running a microwave. The mercenary believes that their signal is being jammed and Evil-Lyn orders him to send a counter-signal to destroy the source. The oven explodes.
"People of Eternia! I stand before the Great Eye of the galaxy. Chosen by destiny by the powers of Greyskull! This inevitable moment will transpire before your eyes, even as He-Man himself bears witness to it. Now. I, Skeletor, am Master of the Universe! YES! Yes... I feel it, the power... fills me. Yes, I feel the universe within me! I am... I am a part of the cosmos! The power flows... flows through me! Of what consequence are you now? This planet, these people. They are NOTHING to me! The universe is power! Real, unstoppable POWER! and I am that force! I am that power! KNEEL BEFORE YOUR MASTER! Fool! you are no longer my EQUAL! I am more than man! MORE THAN LIFE! I... am... a... GOD! Now. You... will... KNEEEEEL! KNEEEEL!"
He-Man gets one near the end of the movie. Having freed himself from his bonds, he heads for Skeletor's throne, where the Power Sword is being held. Every time he grabs for it, he gets electrocuted, until he makes one last grab, pulls it out and, to the sounds of a triumphant soundtrack, shouts I HAVE THE POWER!
For the cheesiness and 80s style special effects, the final fight between He-Man and Skeletor is actually pretty damn good. Apparently the power surge turned off all the lights, and the whole thing is lit primarily by their glowing sword and staff, respectively as they go at each other.
Especially the ending. Pure awesomeness! (The commentary track reveals that the director actually paid for and filmed this sequence out of his own pocket, as the original planned epic battle was never filmed due to time and money constraints. Now that's dedication!)