Who said "The most interesting fact is that the R.O.U.S.'s do not exist."?

This quote is attributed to Vizzini.

The most interesting fact is that the R.O.U.S.'s do not exis... - Vizzini

"The most interesting fact is that the R.O.U.S.'s do not exist."

Vizzini Humor

Character in The Princess Bride

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"Inconceivable!"

"Fezzik, are there rocks ahead? If there are, we'll all be dead."

"The cliffs of Insanity!"

"I am not being paid to make him happy."

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."