A while ago I hit a cut out "hole" in the road which was supposed to become a speedbump. It kinda looked like this: -----____------, and the drop was about 15cm.
Anyhow, there were no signs of roadwork, it was dark, and it kinda was a backroad leading to a hillbilly town (a lot of those in holland), so I was driving 120 on a 80 road.
It didn't result in a lot of damage though, just some scratching on the bottom of the front bumper, but it certainly was the most scary moment I've ever had in a car.