I can't pick just one! BTW, props to the Princess Bride quotes!! LOVE that movie!! The American Film Institute recently had the Top 100 Quotes of All Time, and NO Princess Bride quotes made the list??? Not one.
My own favorites include:
"I can't carry your burden, Mr. Frodo, but I can carry YOU!" -
Sam to his beaten & exhausted best friend towards the end of Return of the King Sniff-sniff!
Steel Magnolias (all said in deep, southern accents):
"He's so confused, he don't know whether to scratch his watch, or wind his butt" - Truvie (Dolly Parton)
"I'm sorry Sammy, but I am not about to spend my life with someone I won't run into in the
hereafter!" - Annelle (Daryl Hannah)
"I'm at the end of my rope with you!" - Weezer (Shirley Maclaine)
"Then tie a noose in it and slip it over your head - Drum (Tom Skerritt)
Finally, ALL of Napolean Dynamite, although it's getting overdone now. Bow to you sensei!
"Sweet! Awesome! Whatever I feel like, gosh! You got like, 3 feet of air that time. Is Pedro there? Get off me, you bo-dagget! It's a Liger - a cross between a lion & tiger, bred for its magic abilities." - All Napolean Dynamite
"Don't be jealous, Napolean, that I've been chatting with babes online all day" - Kip
"Imagine yourself weightless in the ocean, surrounded by tiny, little seahorses....great. That's going to be a good one". - Deb
"Build her a cake or something". - Pedro