We did a rewrite of a truly wacky application component last year that supplied a steady stream of head scratchers. Today I walked back into the room from a late lunch and overheard a customer support manager getting a little hot under the collar over some unexpected, strange behavior in the system. My colleague was explaining what the system was doing when the support manager blurted out “why is it doing that?”
All of us in unison shouted at the speaker phone “because that’s what [old system] did!”
Oddly enough she didn’t care for that answer, but we were able to turn that rule off easily enough in the configuration.