Four into one
I had the dubious honour of working for a Government Department who shifted from a proprietary software package to SAP, so I got re-trained coding in ABAP, and another crew (all 4 fresh out of the local community college) doing Basis Support. Roll on two years and all 4 of the Basis team walk out wanting better money from other companies (this was in the 90s when SAP experience was gold). The department para-dropped me into the situation (solo) with 4 weeks left to get a handover (I was a Unix sysadmin by then) and I spent 3 weeks fixing all the bugs in their Unix system that had created enough work for 3 of them. If their managers had talked to my managers, I could have saved them a fortune in time and effort.