Leonard: And you promise you're okay with everything from the car?
Penny: Oh my God, Will you stop bringing it up?
Leonard: You're right. I'm sorry. We have the rest of our lives to dredge up stuff from the past and fight about it.

Leonard: Penny, as a scientist, my job is to figure out why things happen. But I don't think I'll ever understand how someone like me could get to be with someone like you. You know maybe I don't need to understand it, I just need to be grateful. I love you, Penny.

Leonard: What would you be if you were attached to another object by an inclined plane, wrapped helically around an axis?
Sheldon: Screwed?
Leonard: There you go.

Leonard: My point is, while you're spending all this time on your own, building computers or practicing your cello, what you're really doing is becoming interesting. When people finally do notice you, they're gonna find someone a lot cooler than they thought. And for those of you that were popular in high school, it's over, sorry. Thank you. Congratulations.

Amy: Hold on. You're getting married and you didn't invite me?
Penny: It was kind of a spur of the moment thing.
Amy: Wow. Hope I can catch the bouquet from here.

Leonard: Penny. We are made of particles that have existed since the moment the universe began. I like to think those atoms traveled fourteen billion years through time and space to create us, so that we could be together and make each other whole.

Bernadette: Aww, that was beautiful.
Howard: Yeah. I mean, not like our wedding beautiful.
Bernadette: No, we totally won.