@Gilles had a similar rant and reminded me of a story...

As a kid I learned QBasic. Moved to VB5 and later VB6. Because of this 'knowledge', I was the one who had to maintain legacy applications at my previous job. All of those applications were in use at various banks. On first work day in 2011 all hell broke loose - no date input control would accept the date anymore. I quickly discovered that the max year on date inputs was set to 2010. Later, I was told that nobody expected these applications would still be used in 2010 so they entered it as a distant future number. The funny part was that one bank was still running apps written in VB3 and I had to go back to basics. Didn't even know how to edit basic controls in that interface :D

Good times :)