I spent the better part of a year re-documenting a piece of medical device software that was going to be taken over by a different division of the company. We didn't build any new code, just documentation. This was originally supposed to take 3 months and was going to be done by a single contractor who was supposed to just update documents with new templates.

When we were just a month from completing this project, they laid off everyone involved in the project except for me. I don't know for sure how much this boondoggle cost, but it was at least mid-single-digit millions of USD just based on the number of folks involved.