The man, driving alone, backed his vehicle down to the (boat) ramp at about 7 p.m., thinking he could see if a tire was leaking, said a friend who arrived on the scene later to bring him dry clothes.
As he stood by the vehicle looking for bubbles, the SUV suddenly rolled backward into the water. The man tried to get in the driver's side and step on the brake, but only ended up getting soaked, the friend said.
http://blogs.trb.com/chicago-breaking-news/2008/09/officials-retrieving-car-from.html
Ex-friend.