I rarely see "logic bombs" in the news, but I remember the day the customer called angry on April 1st, complaining that their spreadsheet quit working. It seem

I rarely see "logic bombs" in the news, but I remember the day the customer called angry on April 1st, complaining that their spreadsheet quit working. It seemed unlikely to be an April Fool's Day joke, but I knew the code hadn't changed so I couldn't understand why it would quit working. Root cause? The fiscal year in the spreadsheet started in April, which made it the "zeroth" month, which triggered a logic failure due to this being a false value. It would have made a great hard-to-spot logic bomb... if I had planted it intentionally!