Murphy's Law: whatever can go wrong, will.
Before the exam today we were all joking around about our calculators dying in the middle of the test. Some even shared stories of how that had happened before. I once changed my batteries before the SAT's only to have it die as soon as I turned it on, no "Batteries low, recommended battery change" warning or anything. So we laughed off our nerves and started.
Then my calculator died.
Has something like this ever happened to you?