Louis shows up to apologize for... Whatever the last shitty thing was that he did. As a shitty-thing-doing machine that has no other characteristics, it's getting hard to keep track. Presumably it was about our royal responsibilities in some dumb way. Oh no, I remember, it was the new perma-obstacle in their relationship. He tried to have Chuck hypnotized to do unspeakable things.
Louis: "I come bearing gifts... every perfume Santa Maria Novella has to offer. Feel free to bash the Imperial Lavender over my head if you'd like."
(Imperial = Empire, Lavender = Purple; Imperial Lavender = Chuck Bass.)
Louis: "[Gross-sounding Gallic apologies.]"
Blair: "As in every episode, I forgive you without further ado."
Louis: "By the way, I hate your friends and Serena is going to throw you a shitty party and I spent the whole flight thinking about isolating you from your friends for no real reason except to provide a reason for this episode to exist. It's getting harder but not impossible to come up with these."
Blair: "I will be throwing a boring shit-fit later, presumably."
Louis: "Yeah, probably because of your shitty friends who I suddenly hate."
Nate: "Grandfather! So nice to see you here, at the business you're secretly underwriting to create the illusion that I can do things or matter in any way."
Granderbilt: "It's all you, bro."
Diana: "Hey Nate, [magazine words chosen at random]."
Nate: "Boss girlfriend, meet my grandfather."
Wm. & Diana: "Hello! We have certainly not met before."
Diana: "Anyway, [words]. I'll show this strange grandfather to the door. If you hear hissing, whispered conversations about your destiny do not worry about it."
Aunt Carol: "Cousin Peepers, I told you not to call me anymore!"
Ivy: "But I just got fired and Max just showed up in town. My thin excuse for a storyline is about to fall apart! Can't you hear it in my death-rattle voice?"
Aunt Carol: "I cannot see where or how this is my problem. Pretty sure I told you to fuck off."
Ivy: "Um, I told your mom to fuck off. But so perhaps I will come clean to the van der Humphreys and then..."
Aunt Carol: "-- Um, and then I will have you arrested."
Ivy: "Maybe I will have you arrested! I will have your mom arrested."