THOR: The Dark World -
Loki: I think you missed a column.
Thor: Shut up!
Loki: Look, why don't you let me take over? I'm clearly the best pilot.
Thor: Is that right? Well, out of the two of us, which one can actually fly?
Thor: Not a word. (Thor pronounces each word slowly and does not link words because he is angry and wants to express his feeling)
Loki: Now they're following us.
Loki: Now they're firing at us!
Thor: Yeah, thank you for the commentary, Loki, it's not at all distracting! ('not at all + adjective' means '100% NOT + adjective'. In this case, Loki's comments are very distracting, and so the contrast is what makes this funny)
Loki: Well done! You just (here, 'just' means very very recently or within minutes) decapitated your grandfather! (to 'decapitate' means to cut someone's head off!)