Wasn't the Agile movement kicked off by a group of people writing payroll software for Chrysler?

https://en.wikipedia.org/wiki/Chrysler_Comprehensive_Compens...

Payroll systems seem to be a massively complicated beast.

Arbitrary payroll is absurdly complicated. The trick is to not make it arbitrary - have a limited amount of stuff you do, and always have backdoors to manually pushing data through payroll.

You don't want to get me started on Agile.