Best line

I can't remember the line absolutely verbatim, but I think it's from the Emperor Stark episode where it centres on the Vision's return to consciousness, and after defeating something the Vision casually states "Well that passed with minimal difficulty", to which Hawkeye exclaims "Did you just say that was easy? You NEVER say it was easy!" and the Vision just blankly asks why. That always makes me laugh.

I've always loved he two from Ant-Man: when he yells "science!" And later on when he diffused the bomb after saying there was nothing he could do "just to see the look on [Brandt's] face."

I really liked Hawkeye's lines in this show:

"tick, tick, boom!"
(to Bruce Banner) "first of all, you are not an Avenger, the Hulk is. Saying that you are an Avenger, is like saying my bow is part of the team.."
And tons of more.

Baron Zemo: You are the aggressors here, your monster attacked my monster.

That one always cracks me up.