Murphy's law

Why is it that whenever we need to finish something in time stuff goes wrong. I’m not used to that. Usually the closer to the deadly the more productive I become and luminous ideas come to mind. Today I did a lot of last-minute work on the dificult calculations which we had finished yesterday, but which needed alterations again today. And when my business partner tried to finish it, something went wrong with Zend for Eclipse (an editing application we use) and somehow an older version (the one without my alterations) was saved over my file… so I spend the last one and a half hour redoing the work!… shit happens!