About a year ago a stream had burst its banks and decided the road was a good alternative. In the dark, turned a corner and the road level drops about 12", exactly where the stream had burst its banks. I went through at about 15-20mph realised it was a river IN the road and thought well, I'm in now, best keep going. The water went through my grill and basically weighted down the undertray, as well as the tray cutting into the water it bent in half under the car. The main issue being is that it ripped chunks out me underside of my bumper.
I couldn't move or anything (once out the water) and had to be recovered, well the RAC chap just took the whole tray off.
As you can see the flat bits are no longer flat!
I could have straightened it out but fancied a new one.