As I also have an '04 Camry (4cyl AT), I am very interested in this. I have “runaway” experienced twice. The first time result is shown in the photo. I’m pretty sure this was just foot-on-wrong-pedal; passenger asked me a complicated question just as I was pulling up to the parking bumper. Fortunately, no damage to people or property. But I did feel like a fool.
Second time was pulling up to a drive-thru ATM. I was wearing big galoshes. With left side of (right) foot on brake, right side of sole was still dragging on accelerator. Accelerator was winning for a moment, until I realized what was happening and rolled foot to left.
Could you have had your foot on both pedals? A small push on the accelerator needs a big push on the brake to make it stop.