The Avengers - when Cap joins the fight between Thor and Iron Man, Cap tells Thor to put the hammer down, Thor says You want me to put the hammer down? and then does so, on Cap's shield, which levels the forest
Iron Man - when IM has just rescued the hostages in the town and the tank fires on him, he returns a single shot then turns to walk away as behind him, the tank explodes
Captain America the Winter Soldier - elevator scene - Cap is surrounded by a bunch of agents and says, Before we get started, does anyone want to get off?