Night Watch and Vetinari
"Shower Thought" moment as I listen to Night Watch for what seems like the millionth time.
Near the beginning of his time in The Past, Vimes thinks a comment about how everyone in their late-teens/early-twenties goes through a "twerp stage", essentially how we all have moments of feeling smarter or more cunning or more politically savvy than we actually are.
Young Vimes is a typical twerp in this regard, and one I deeply relate to in his naivety of how the world works. It's almost endearing.
I find Vetinari to be both unsettling (because it's so weird for how he is later) and amusing (see below) in his twerp-ness.
You can see the early stages of his political and social awareness, but it has an element of teenage arrogance that makes me grin (I teach pre-teens and teenagers). His annoyance at his aunt's actions (in regards to the scene in the carriage) but still deep love and respect for her. His unwavering belief that he is better than everyone else around him (he is, but he hasn't quite got the skills to completely control the room/conversation/narrative, yet).
What got me unsettled (and later grinning) was the idea of him sprawling in the chair in his aunt's room. The very idea of Vetinari not sitting as though he commands the room, but rather as a lazy/tired teen talking with his aunt is so strange that is in funny.
On a side note - you can absolutely see where he got some of his cunning and ability to manipulate people. His aunt is a master at it. And I like that scene because you see many of the mannerisms he later adopts for himself, including the ability to manipulate Vimes.