Live performance by Loki at SDCC 13.

(Replaced with better video)

Here's everything he said (the video is missing parts):

"I am Loki! Of Asgard! I am burdened with glorious purpose. Stand back, you mewling quim. The bright year of freedom diminishes your life's joy in mad scramble for a place in his chamber. In this meager palace of Midgard, the arena they call Hall H. You should have let me rule you when you had the chance. Yet here you are! Kneel! Your ears yearn for untold stories. Your eyes crave unseen sights... your imaginations ache and hunger. Where are your Avengers now? Claim loyalty to me and I will give you what you need." And he made the crowd shout his name again and again. Then he said, "It seems I have an army."