This looks like a job for inadvisably applied magic if ever I saw one.

And the people next door oppress me all night long. I tell them, I work all day, a man's got to have some time to learn to play the tuba. That's oppression, that is. If I'm not under the heel of the oppressor, I don't know who is.

If you want to change a whole people, then you start with the girls. It stands to reason: they learn faster, and they pass on what they learn to their children.

When you break rules, break 'em good and hard

That's a nice song,' said young Sam, and Vimes remembered that he was hearing it for the first time. It's an old soldiers' song,' he said. Really, sarge? But it's about angels.' Yes, thought Vimes, and it's amazing what bits those angels cause to rise up as the song progresses. It's a real soldiers' song: sentimental, with dirty bits. As I recall, they used to sing it after battles,’ he said. 'I've seen old men cry when they sing it,’ he added. Why? It sounds cheerful.' They were remembering who they were not singing it with, thought Vimes. You'll learn. I know you will.

At some time in the recent past someone had decided to brighten the ancient corridors of the University by painting them, having some vague notion that Learning Should Be Fun. It hadn’t worked. It’s a fact known throughout the universes that no matter how carefully the colors are chosen, institutional decor ends up as either vomit green, unmentionable brown, nicotine yellow or surgical appliance pink. By some little-understood process of sympathetic resonance, corridors painted in those colors always smell slightly of boiled cabbage—even if no cabbage is ever cooked in the vicinity.

The city's full of people who you just see around.