Mine the german hamlet episode. “Oh look, Hamlet faxed me a soliloquy!”
I like “Werewolf” the best out of all that I’ve seen.
Crow: So, his plan is to rid the world of security guards by changing them into werewolves one by one and then having them crash their cars?
Mike: Well, it seems to be working well so far.
Natalie: Wahrwuulf?
Servo: No, no, say it with me, “werewolf”. “Were-wolf”.
Yuri: The natives call it ‘Skinwalker’.
Crow: Texas Skinranger.
I’ve only got 5 on disc, need to get MOAR!
My fav is the first one I ever saw, no idea what it was but when (in the actual movie) the actor walked in to a spaceship and said “How do you keep this fantastic temperature?”.
Most random line I’ve ever heard 
It might have been the pain medicine, but watching The Giant Spider Invasion while I was laid up after having gotten my wisdom teeth removed was one of the best things ever.