What To Do: If you drive a stick, hopefully you already know the reason that would cause a clutch to go limp. But then again, there are a large majority people who aren't the ones checking their fluids. They pay people to do that. So, listen up.
If you're on the road, and your foot keeps sinking farther and farther into the floor, without any push back from your clutch, your clutch hasn't gone bad. You'll know by the revving RPMs and immobility, when that happens. Pop the hood and check your clutch fluid. There's a good chance it'll be low, meaning you're going to need somebody to go get some and bring it to you.