My car died on the freeway exit, so i tried to start it up, and it mage a bigass "clunk" sound...

I sure hope that it's nothing too major. And a little oil is dripping from the bottom. I left it at the dealership they will call me tomorrow.
Any ideas as to what it could be? Rod? Piston? The starter turns the flywheel a bit, then "CLUNK" and the car shakes violently. Just before she died, I smelt a bad rubber/burnt oil scent.
Anyone?