How we cite our quotes: All quotations are from It Happened One Night.
Quote #1
PETER: Just a spoiled brat of a rich man. You and Westley'll make an ideal team.
This is Peter's verdict before he gets to know Ellie. The film, of course, proves him wrong in more ways than one.
Quote #2
PETER: Ever hear of the word "humility"? No, you wouldn't.
This is from another of the speeches Peter delivers against the rich. He's hell-bent on reminding Ellie how spoiled she is, and this reveals his biases. And yet, the dude has a point, as Ellie herself seems to see, eventually, when she changes her ways.
Quote #3
PETER: Say, where did you learn to dunk, in finishing school?
Peter makes fun of Ellie for not knowing how to dunk a donut the right way. She's a quick study, though, and she thanks him for the pointers. Donuts here stand for simple food, and the viewer can imagine that Ellie's used to much fancier breakfasts.