It may interest you to learn that this nearly happened in Australia (Darwin, I think). It was widely reported in newspapers at the time that someone's ute was destroyed by a missile seconds after he parked it and got out. The story goes that an air force plane was starting to land when a 'software glitch' 'released' one (and only one) of the missiles it was carrying, which fell into a populated area. The Air Force offered no further explanation. However I'm guessing that they write their own software.

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Jeremy
I didn't believe in evil until I dated it.