CleverRaven/Cataclysm-DDA — pull request #9163 by kevingranade (2014-09-21 19:45:25+00:00)
Title: Add an argument to map::bash() indicating the source of the bashing.

This prevents vehicles from hitting themselves instead of terrain they run over.
To reproduce the issue, drive over a flower such that the front wheels of the vehicle don't hit it, then turn such that the rear vehicles do.
Alternately you can probably reproduce by using a vehicle with frames in front of the front wheels and just running over flowers.