What do you do?

I had to do one the other day and ended up locking both wheels and skidding to a halt about 2ft behind they car. I presume using my breaks a bit better would have probably helped somewhat, but how much does that actually work if you really have to stop stupidly fast?

I have posted this further down, but the whole thread rarely gets read (I know I don't quite often), but I do know how to break. As much as anything I'm curious as to what has happened to you when you've been in the type of situation where you stop fast or see the underside of a car.