Murissokah :
I bet it wouldn't crash, but it would freeze quite often.
[:manofchalk]
I see what you did there...
You cant put your PC inside a fridge for a couple reasons.
1. Your fridge cant handle it, they aren't designed to cool a constant heat source, just to bring the contents down to a temperature and sustain it.
2. Condensation will form when you turn on the PC, the warming computer parts will draw the moisture from the cold air and promptly short itself out. So unless you want to insulate the computer in some way or run a dehumidifier inside the fridge, thats a reason why not.
3. There are more efficient ways to cool a PC to below ambient temperatures, such as Ryan's Peltier solution.