I seem to recall reading one about a man who decided to rob a store... a gun store... full of armed customers... with a marked patrol car outside... and a police officer standing next to the register... in a state where licensed adults may carry concealed firearms in public...
Guy fired three shots into the air randomly to announce his holdup and was shot down promptly by the (armed) cashier and police officer and at least three customers.
Not sure about the source, think it was a Darwin Awards book.