Or some idiot drives into a lake or down a jogging trail because he or she is just TOO STUPID to understand that they're not driving on a road anymore.
I once was told by my SatNav to drive into a lake. There is a lake, an island in the lake with a major tourist attraction, a ferry, and the road goes straight to the like so you can drive onto the ferry (and you need to have some good reason to do so because car traffic is normally not allowed on that island).
I actually drove past the car park 150m away from the lake before I spotted the end of the road. In the dark you could easily drive into the lake without being a complete idiot (a bit stupid and careless, but not a complete idiot).