Thanks. For some reason, there was a time in my life when I watched the videotape of that movie at least once a week. I practically had the damn thing memorized.
‘Around the World in 80 Days’?
Correct.
Afraid not.
“There are three men before whom a woman need have no shame: her husband, her doctor and her magician”
Try and get that one without googling it.
Here’s one that’s probably pretty obscure:
“All astronomers are amateurs. When it comes to the heavens, there’s only one professional.”
Colin “The Forger” in The Great Escape.
Houdini?
Right you are, played by Donald Pleasance (who had been, I believe, in a POW camp in WWII)
Nope. Try again. It’s pretty obscure, I’ll grant you.
There’s no Moriarity, just …
Do you hear it? Nearer, nearer, can you see him now?
Not yet – yes, I see him. He’s everything you said he was.
“I’m trying to decide between Poli Sci and Home Ec.”
They Might Be Giants (1971)
(If you hadn’t included the reference to Moriarty, I never would have gotten it. But I’m surprised I remembered it at all, from 50 years ago!)
Barbra Streisand in What’s Up Doc ?
Nope, sorry. The film I’m thinking of is a real niche piece.
Think “self-immolation.” 
“It has the mark of some Lost Civilization”
“It’s…Absolutely…Imperial!”
“I have a malignancy in my prostate…but when I’m with you, it’s benign.”
Don’t worry, on a new job it’s quite common for things not to go well at first.
Damn, I know that line about shame, husband, doctor, magician. I’m hearing it in Vincent Price’s voice. Am I close?
New one:
“I am the business.”
“Do you have any lines available for celebrities, or emergencies? […] I’m both. I’m a celebrity in an emergency. Can you put me through on that line, please?”