I think I found this thread too late. My Princess Bride line is listed, so is my favorite scene from Indy 3.
If you've ever seen the Blues Brothers, when Dan Akyroyd and Joh Belushi are trying to get away from one of the police cars inthe middle of the night, he says, "Oh our Lady of Blessed Acceleration don't fail me now!" - that just cracks me up whenever I hear it.
I also think from Star Wars when Luke and Obi-Wan are looking down at Mos Eisley, Obi Wan says something like,"Mos Eisley Spaceport. You will never find a more retched hive of scum and villainy. We must be cautious."
Okay okay thought of another one....just watched the entire length of the Three Musketeers last weekend at my mom's. Had never seen like the last half. Oliver Platt on the ship with the oriental guy and the swords - funny! - my son rewound that scene 4 times and literally was rolling on the floor! Also at the last fight scene, Charlie Sheen's character is swordfighting with the bad guys and skewers someone and says, "Go with G-d." just in a serious tone of voice that just was funny.