I once worked on a project, from specs to deliverable, unfortunately it was all canceled at the end due to the fact that I could not duplicate the sales reports that were being produced by the system being replaced.
After manually tracking down all the differences due to data loss in the old system for one reportable month, I still could not match the numbers, so I headed to the VP of Sales, which quickly told me that he knew that the reports were wrong, and he ran them through a process to correct them. When I asked him about this process (which no one else seemed to know anything about) he quickly said "I put them on a spreadsheet and then type in the correct numbers" ... The source for the "correct numbers", he knew what they should be.
Soon after, I approached the CEO with this information and the project (and me) were quickly shown the door for not being able to carry out the project correctly... By the way, the chairman of the board agreed, as he did not want to "throw good money after bad" with the new system, which was clearly deficient.
As to the sales report, care to guess which two names where almost always at the top of sales performance? And care to guess who used the sales reports to sell the co. and make a s*** load of money after sacking the CEO and VP of Sales soon after my departure?