I witnessed one myself when I was working as a consultant. It was a hospital that chose SAP to automate its invoicing system. When the implementation got stuck, the hospital was unable to send out any invoice for almost a year. In the end the money was finished and the government had to jump in and take over.

It is true that the management of the hospital made some big mistakes, but on the other hand it was SAP's sales team that had been very good at giving them opportunities to hang themselves.