I was playing a Grenade and Knife TDM and the platforms were made of wedges. Two things:
1. I threw a grenade that hit the edge of a platform and, because of the weird wedge physics, it bounced back.
2. I was the last on my team and I was running like hell from Kojolika or some other good knifer and I landed on a platform. Once again because of the weird physics, I jumped four bricks ahead and fell off.