I've heard a lot about dungeons with non-standard gravity. After the PC's fall in random directions a few times, they learn to throw things in front of them to see which direction the gravity pulls. But it can make for a lot of interesting challenges and traps.

But two questions:

What combat encounters have you run in such non-standard gravity places? Did the gravity play a major role?

A party finds a place where the gravity pulls down a hallway, but the hallway has a slight curve. Has anyone made a circular particle accelerator? Or rather, has anyone played a Large PC Collider?