"Knife? THIS is a knife!" (Croc Dundee)

minimalist choice: Best line in "Contact" is delivered by Rob Lowe when he sees a funny blip on his scope :
"HELL-LO!"

and a few selections from my under-quoted favourite, The African Queen: delivered by Kath Hep. "You promised, Mr Olnutt!"
"Dear--what is your first name?"

and the German captain: "I now pronounce you man and wife, proceed with the execution."