They can't all be from the same movie, can they? The last is from Singing in the Rain.

I don't think that all of the ones from my first post were solved, but I'll post some more:

This one is incredibly simple, but still it's so good:

"The haunting memories of lost love... May I? Lights? Our eyes met across the crowded hat store. I, a customer, and she a coquettish haberdasher.
Oh, I pursued and she withdrew, then she pursued and I withdrew, and so we danced. I burned for her, much like the burning during urination that I would experience soon afterwards."

"Let me tell you something my friend. Hope is a dangerous thing. Hope can drive a man insane. "

Also easy, but still a favorite: "I do wish we could chat longer, but... I'm having an old friend for dinner. Bye."

"Wait Master, it might be dangerous. You go first."

"I've already wasted my whole life. I want to tell you with my last breath that I have always loved you. I would rather be a ghost, drifting by your side as a condemned soul, than enter heaven without you. Because of your love, I will never be a lonely spirit. "

Is that Hannibal Lechter talking on the phone with agent Starling in the final scene?

"Wait Master, it might be dangerous. You go first."

Young Frankenstein

How about this: "It's okay with me."