There are literally loads of these videos on Youtube - it seems to be a well established spectator sport.

This one is with the ford clearly marked at three feet, yet amazing how people attempt it (and fail), often in expensive cars:




Many years ago I had a Jag S-Type R - and unfortunately got caught in a flood with it. I would say the water was about eighteen inches deep. There was a dull thud, and £16k of damage was done to the engine...

Anyone else had similar, or just enjoy the vids!