Here's some of my favorites --
Luke buys the building next to the diner after his confrontation with Taylor. S2E15 Lost and Found -- "I had to do something. I had your voice going round in my head. It's like the Small World song. 'Take a chance, Luke. Make a move. Can't have a single bed. ' So I bought the building! Went to the bank, got a cashier's check signed the papers, and I bought the building. I am the building's owner. I own the building."
Luke yells at Lorelai for buying his dad's boat and hiding it in her garage. S3E10 But Not as Cute as Pushkin, Lorelia and Luke's first real fight as a couple -- "You thought about you and how you'd feel. You didn't think about me, or the fact that I said I wanted to get rid of this damn boat. I mean, I said it, Lorelai. I said it, you heard it, and you ignored it. You had no respect for what I wanted. This was my dad. This was his boat and this decision was mine. This was not yours."
Luke tells Jess what is expected at the apartment after Jess and Rory get together. S3E08 Let the Games Begin -- "You are not allowed on either end of this apartment. You are, instead, to remain here in the middle portion of the room. You may sit on the couch or on the chair, as long as you two are sitting on separate seats, i.e. when you’re on the couch, then she’s on the chair. When she’s on the couch, then you’re on the chair. LUKE: On weekdays, you will have her home by nine. On weekends, you will have her home by eleven. Any evidence of alcohol, cigarette smoke, or anything else that Nancy Reagan would find unacceptable and you will not be allowed near her without an adult present. Are these rules clear?"
Luke is upset at the women breastfeeding in the diner and wants Lorelai to stop them. S03E05 Eight O'Clock at the Oasis -- "When did that become acceptable? In the old days, a woman would never consider doing that in public. They'd go find a barn or a cave or something. I mean, it's indecent. This is a diner not a peep show! Hey, consider making it a combo. Of course, no one would ever feel the same ordering a glass of milk again, but I have to do something. I just can't stand here and let the lactating continue. Gross? I'm gross? I'm not the one exposing myself for the entire world to see. That's it. You go make her stop. Why not? You''re a woman. You have the same parts. Scared of it? I am being taken advantage of here, and I do not like being taken advantage of. I hate this! Oh geez! Okay, well, that was kind of fun."
Luke and Lorelai go car shopping and he finally rants at her again, S07E19, It's Just Like Riding a Bike -- I'm not [hungry] and besides I wouldn't eat anything that came out of that bag. I can't believe you still haven't cleaned that thing out. How much time do you lose a day looking through that thing? I bet you'd gain a month if you just took an hour and cleaned it out, but no -- what? You're smiling.