I'm amused by the amount of "funny money" that gets passed around at these institutions. Departments charge each other for this and that, but it all eventually comes out of the same pool. (Yes, I understand the cost accounting aspects here, and no, I don't have a more efficient system that balances incentives well. It's still amusing.)

As a doctoral student, I'm getting charged out-of-state tuition, but it's all paid for by the university. I've been in-state for long enough now (and bought a house!) that I could get the resident rate, but since I don't pay it, it doesn't matter.