Penny: Here's a question-- as an alien pretending to be human, are you planning to engage in any post-prom mating rituals with Amy? Sheldon: There are post-prom mating rituals? Penny: Not always. Unless your date drives a van with an air mattress, then always. Sheldon: Well, if it's part of the prom experience, then I'm open to it. Penny: You're kidding. Sheldon: I may be an alien, but I have urges.If Amy wants to copulate by firing her eggs into space, well, then, I will happily catch them with the reproductive sac on my upper flermin. I'm not the best at reading facial cues, but I can see that you're a little turned on.
Amy: Sheldon, there's something else I've been wanting to say, but before I do, I just... I want you to know that you don't have to say it back.I know you're not ready, and I don't want you to say it just because social convention dictates... Sheldon: I love you, too. Amy: You said it. Sheldon: There's no denying I have feelings for you that can't be explained in any other way. I briefly considered that I had a brain parasite. But that seems even more far-fetched. The only conclusion was love.