The whole book. "Nobody remembers the singer. The song remains."
The illustration of Death cheerfully petting a confused (but not scared)-looking cat.
Rincewind being so moved by the sight from the moon that even he, of all people, can't manage sarcasm.
Cohen and his band went back to Fingers Madza, the Thief Who Stole Fire, and not only paid their respects, but cut him loose and gave him a sword to enact revenge against the eagle who has been eating his (regenerating) liver for a very long time.