Thanks for all of the replies.
Seriously, it must have been a fluke, because the car has been driven 200 miles since- with NO problems. The "check engine" and "ETS OFF" lights are illuminated, so perhaps it is something electronic. I did notice once last evening the speedometer was "fluctuating" a bit, then returned to normal. Perhaps a bad/faulty speed sensor? I guess we will have it and have code ran on the "check engine" lamp. Thanks again.