Fluid mechanics - What made this soda can burst?

I had several sodas on the top shelf of my fridge, in the center of the shelf at the very back. One morning I opened my fridge and one soda had fallen over, exploded (the top was totally gone, I still haven't found it), and was frozen solid. Even the bottom was caved outward, indicating the contents expanded when it froze (I assume). But, nothing else beside it was frozen.

Pictures here!

Nothing else in the fridge had ice forming, I've never touched the temperature controls, and this has never happened in the two years I've had this fridge. And this soda can had never been in the freezer. How could one can freeze but the others right beside it not?

I thought maybe the can was faulty, and if the lid gave out and if the contents suddenly expanded they could possibly freeze? But that might not explain the bottom being caved outward. Perhaps that particular spot in the fridge is colder because of air circulation? I don't have a thermometer but I have set water bottles to try and repeat what happened. I set one upright, one on it's side, and one - mostly empty - water bottle on it's side all in the same area the burst can was. I'll update if they freeze or not.

I'm totally stumped, and I'm not a physics major, what do you guys think?