A friend of mine's wife was baking a cheesecake, which she does somewhat regularly. The house filled up with smoke, and when they opened the oven, they observed that it had caught fire. Apparently it was a fairly standard cheesecake, not a unique petrol-flavored version, nor even spiked with a healthy dose of brandy. She proceeded to remake the same recipe immediately after with no further conflagration.
I did a bit of googling and the only conjecture I saw that somewhat jibes with the circular burn mark is that somehow liquid fat separated from the filling, pooled, and caught fire.
Any idea why specifically that would happen, or alternative explanations?