Ever jumped your car? Try this

not like that but a few times over fairly large railways tracks or crests in the road.  You just have to be a little careful with mid/rear engined cars as they tend to go ass-up. The way i had it explained to me by one of the VIP petfood Porsche guys was that it's cause we run harder springs in the back cause of the weight so when the springs decompress they launch the back of the car up... so you can't see where you're going and risk damaging the front of the car....
 
tend not to do it very often buy i like to know how cars that i drive slide AND fly just in case.... last time i had wine bottles in the boot and they smashed and wrecked my carpet liner... BOO

I've taken a commodore over some railway tracks and got up a bit, but I've never been able to bring myself to do it in the mr2, I'd feel like I'm going to rip the front out of it.