I've always liked when Servo starts to panic when he thinks Manos is going to be a snuff film, and Joel is trying to reassure him :-)

That and the "Move, move!" segment in Space Mutiny.

Oh, and "I'll come over there!” from Mitchell

Star Fighters. "Poopie suit?!?" And all the Servos doing the choral rendition.

Final Sacrifice: “It says ‘Do Not Wrinkle’” when Troy pulls out the map

Time Chasers: “Where’s your filth?”