What did you do as a teen that could of gone horribly wrong looking back?

Getting into a car with a driver who had been up all night working. No drugs or alcohol involved,, just really tired. He swerved so badly I, as the passenger, was looking up the center of the two lane road. Only reason there wasn’t an accident was there was no other traffic. We pulled over to the side of the toad and he slept for a few hours. Don’t drive tired.