"You should try it, amigo. It’s the ultimate invisible American population. Prisons have everything that interests you. People with a lot of spare time. Weird economics, based on drugs and homemade tattoos. There’s a lot of time to think seriously. You really do regret your old mistakes inside a penitentiary." Burningboy had an impossibly remote look now. Oscar was losing him; it was as if he were bound on a flower-decked Valkyrie ship for the shores of Avalon. "Besides, some of those poor evil bastards are so far gone that they actually have bad teeth . I can practice dentistry again, when I’m in stir. Did I ever tell you I used to be a dentist? That was before the caries vaccine came in and destroyed my profession."