I once fell off the map on one of the greatwall maps (I can never remember which one is reloaded, remix, etc, but it was the one where the bases are not in line, and it wasn't the one with the turrets). I was on the middle of the flag room's right wall when I just "fell through" the edge of the map. I think I had a lag spike at the same time too; maybe the server was overloaded and skipped on the physics calculations for a split second. Also, I think this was on 2.4.2, but I once was able to go through the invisible ceiling on arboria on a local server. I was using the hook on the sky (yes, yes, bad MRB

) and somehow I just went through it. Just thought I'd throw these out there.