Season 6, Episode 23: "The Face Painter"

Take toilet paper, for example.

Do you realize that toilet paper has not changed in my lifetime?

It's just paper on a cardboard roll. That's it.

And in 10,000 years, it will still be exactly the same...

...because, really, what else can they do?

Yeah, that's true.

There really has been no development in toilet paper.

And, I mean, everything else has changed.