Also on a related note: When Cosmo reveals that Ventari visits Wuffles' grave once a week and lays a single dog biscuit on it.
But never the yellow ones, because he didn't like the yellow ones.
When Adora learns that Moist doesn't do dangerous stunts when she's around because she's all the excitement he needs, she demands that he give her a kiss.
Oddly enough, when Cosmo wakes up in the Vetinari Ward of the psych hospital. For the entire book, he had walked a strange line between a brutal and resourceful villain and...well, a Vetinari fanboy. He even bought a complex clockwork device that would do nothing but raise one eyebrow for him. This troper couldn't help but feel a bit good when he's shown to be content with his accommodations, now that he's completely fallen into his Vetinari fantasy. This line in particular:
"Cosmo beamed. And two weeks later, when he won the eyebrow-raising competition, he was happier than he'd ever been before."
When we learn that Hubert bawled all through Topsy's funeral.