Wild Cook Straight ferry crossing, between North and South Island's of New Zealand, some serious damage to some vehicles but not the Kombi!
http://www.youtube.com/watch?feature=player_detailpage&v=RPjWMDAYWZs
Oh dear!
guess the straps were tight enough but not
strong enough 
Gold....
At least the kombi was safe. Trucks and modern cars are easy to replace.
Be a bit heart breaking though to stand above your car while it get bashed up, all the while wanting to spew from sea sickness