From Post #5 in this thread
Autoblog posted an explanation for the other cars....
Motor Trend was driving the Camaro. Car blog Jalopnik showed up and crashed the PR event driving a Mustang and Challenger, apparently upsetting the GM PR rep that was there
http://www.autoblog.com/2008/08/25/f...f-muscle-cars
The Motortrend guys were getting the Camaro and the others found out and showed up to be "funny"