"Oot!" (The Princess Bride, by Buttercup, after she rolls down a hill and finally stops at the bottom.)
"Not to fifty!" (The Princess Bride, by Count Rugen when Prince Humperdinck sets The Machine to its maximum.)
"Nonsense. You're only saying that because no one ever has." (The Princess Bride, by Westley after Buttercup says they can't survive in the fire swamp.)
"Inconceivable!" (The Princess Bride, by Vizzini several times.)
"You keep using that word. I don't think it means what you think it means." (The Princess Bride, by Inigo Montoya to Vizzini, after the final time he said 'Inconceivable!")
It's amazing how many Princess Bride lines can be used in normal conversation!