WPXI reported that in October of 2007, Bill and Mindy Shearer of South Buffalo Township, Armstrong County, Pennsylvania, spotted what they believed was a mountain lion near their home. They said that the creature was lying and rolling on its back and they were certain it was a cat, not a dog or deer. The explanation, of course, was offered that it was an escapee pet.
Unforttunately, my computer won't run the associated video of their sighting, so I can't offer any opinion on it. Interested readers can find the video at the above link.