The interactions between Thor and the other Avengers. Always puts a smile on my face. The next Avengers movie should definitely have a funny scene with this in it. XD I feel like Thor would call him metal man though.
Captain America's a little worried about this Mandarin business, but the rest of the Avengers seem pretty chill. (Check out the gif on clickthrough where Cap asks why Thor's a cardboard cutout.) "Terrorists are bad for my blood pressure.