I already squeed at you via Twitter, (It was a manly sort of squee... no, who am I kidding, no it wasn't.) BUT!
The Chitauri/Browncoats had me IN TEARS. 100% brilliant.
The Goofus/Galant joke! Even if it's over the heads of most of the young-uns! Don't care!
The Fellowship riff! "And my bow." (Considering that Tony actually calls Hawkeye "Legolas," even better.)
The... well the whole damned thing, for serious. Bravo, bravissimo.