1 Charon: The River Lethe.
2 Adam: Excellent. Now to test the myth that those who drink from its waters lose all their memories.
3 Charon: You really don't have to. It's true.
4 Adam: Yes, but how do you know?
4 Charon: Well I haven't drunk from it, for starters.

I gotta say, the method I use now to produce the background for these Charon strips is a lot easier than the method I originally used, which involved pasting in some actual rock walls I'd photographed.

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2018-12-08 Rerun commentary: That method being using the "Clouds" renderer in Photoshop, with black and dark grey as the selected colours (as opposed to light blue and white, which makes a cloudy sky).

The blue towel to represent water is a pretty good effect though, that I would use again.