Thor: It's unwise to be in my company right now, brother. Today was to be my day of triumph!
Loki: It'll come, in time. If it's any consolation, I think you're right. About the Frost Giants, about Laufey, about everything. If they were able to slip past Asgard's defenses once, who's to say they won't try again? Next time with an army.
Heimdall: Tell me, Loki, how did you lead the Jotuns into Asgard?
Loki: Do you think the Bifrost is the only way in and out of this realm? There are passages between worlds to which even you, with all your gifts, are blind. But I have need of them no longer, now that I am king. And I say, for your act of treason, you are relieved of your duties as gatekeeper and no longer citizen of Asgard!
Heimdall: Then I need no longer obey you!