Here's one more recent than 20 years: http://www.theregister.co.uk/2009/07/30/typo_caused_massive_ms_bug/ http://www.theregister.co.uk/2009/07/30/typo_caused_ma

Here's one more recent than 20 years: http://www.theregister.co.uk/2009/07/30/typo_caused_massive_ms_bug/ http://www.theregister.co.uk/2009/07/30/typo_caused_massive_... You're right though, with care and skill, typos really shouldn't be an issue