Uncanny Web-Slinger
Super Freak
I imagine a brief scene where Thor is conversing with someone (maybe Odin) in trophy room, they're referencing the tesseract and how important it is not to let such items fall into the wrong hands ever again. Focus on a few items - the tesseract, the frozen casket - then have a slightly longer pause on the infinity gauntlet. Leave it there, the film moves forward....movie ends, cue up the post credits scene with a guard patrolling the trophy room, camera moves past him to slowly pan onto the ,now empty, pedastal that once held the gauntles. Screen black.
That sounds great