I think either episode 10 of Tierra, or episode 9 of lost cause are good candidates.
Best Lines from Tierra e10
"That's it! I'm drawing an imaginary line in the dirt!.... chhh... not so imaginary, is it..."
"Well, I take this amazing peice of 24th century technology known as a STICK... AND I use it in the dirt like n-yah, n-yah, and perhaps a big touch of n-yah, and there! One line in the dirt!"
Best Lines from Lost Cause 7
"Have you, or your ancestors, or your descendants, ever had a relationship with an African mountain gorilla?"
"Have you, or any of your robot b-brgh-bretheren, had any contact, with a mutated -- who write this? -- mutated hamster that bears a striking resemblance to George Michael?"
"'Cause that's the way, uh huh uh huh, we like it! Uh huh uh huh! Chicken wings, the chi-cken wings, we love it! We love it! We love it! We- what?"
If there's one thing you can say about mankind
There's nothing kind about men