[The fact that it catches Steve by surprise is hilarious even to him. He is slowly driving himself mad with his own paranoia. He double checks everything. He's anxious all the time because for days he was attacked nonstop by the people who were supposed to be protecting everyone and had his privacy violated on a regular basis. That's say nothing about all the manipulation going on.
All that effort and he can't even see a piece of uncooked popcorn flying at him. Steve laughs louder than he really should given the circumstances. Give him a break. It's been a rough future.]
You just couldn't help yourself, you big jerk! [He less elegantly tosses a kernel at Bucky's cheek in retaliation.] I'm trying to enjoy a nice meal here.