What can we do with physics?

There was a discussion about fly-mode in MORE once. In that, Chogon replied he'd rather see an Age that used the physics engine to do that (as in some Age with anti-gravity where you can fly up shafts and things like that). Ever since then I've wondered just what we could do in terms of weird physics with PyPRP. I've never seen anything in the Wiki or elsewhere that talked about this. So, does anyone know what sort of weird physics could be used? Preferably with a walk-through for those like me who have difficulty figuring this stuff out. 
