http://mydeathspace.com/article/2009/06/14/Brandon_Shelton_(16)_went__mudding__and_drowned_wh en_truck_slid_off__30__cliff_into_Lake_Whitney
This article to me didn't make it clear if they were "mudding" when they died. This one does
http://www.kbtx.com/home/headlines/43037922.html
Teens Killed In Freak Lake Whitney Accident Identified Save Email Print
LAKE WHITNEY (April 15, 2009)-- Whitney High School students Zach Stout, 18, and Brandon Shelton, 16, were killed Tuesday night when their truck plunged off of a 30-foot cliff and landed in Lake Whitney.
Lt. Larry Armstrong of the Hill County Sheriff's Office told News 10 the accident happened at around 4:45 p.m. near Harmony Point on Lake Whitney.
The two were, "mudding" and "doing donuts," both of which were described as reckless, off-road type activities, when the truck, a single cab Dodge pickup truck, went off the edge of the cliff, Armstrong said.
An eyewitness told authorities the teenager later identified as Stout hit the back window when the truck landed upside down in the water; it wasn't known if he and Shelton were wearing seat belts.
The witness, who was fishing at the time of the accident, attempted to rescue the two teens, but was not able to break any of the windows.
Both doors were locked.
The bodies of both teens have been sent to Dallas for autopsy
What a strange hobby
en.wikipedia.org/wiki/Mudding