Albert's attempts to explain the Uncertainty Principle to Death, using a cat in a box.
The cat dies when the air runs out?
Things will have come to a pretty pass, Albert, if I did not know whether a thing was dead or alive without having to go and look.
Anyway, I don't hold with cruelty to animals.
The illustration of a kitten playing with Death of Rats's tail.
They mention how one of the Silver Horde died by choking on a concubine. They meant cucumber. Hilarity Ensues.
One of the final scenes, where Cohen and the Silver Horde have finally died after falling off Corii Celesti into the equivalent of a nuclear explosion; the Valkyries turn up to take them to Valhalla, and they decide they don't feel like being dead, so they proceed to mug the Valkyries and steal their horses!
"The Circulation of the Vomit" will leave you in stitches.
Rincewind recalling the worst birthday present he ever received: A badge with the text "Hello, I Am Five Today!" On his sixth birthday, no less.