In my dream Hawkeye was training someone on how to fight with a knife (it was just like that scene in Secondhand Lions). Hawkeye started talking about how good his eyesight was, and he brought up this city in the sky that only he could see. Obviously he was talking about Asgard. To prove it, he looked up at Asgard, and at that exact moment Heimdall happened to be looking at Hawkeye. Their eyes locked...and the most epic staring contest of all time began.
Personally I'm betting on Heimdall.