So, a massive formula change in the app. Client warned upfront that old data will also show revised values after change. Changes made, tested and this morning rolled out.
Support question just now (1800 local time on a Friday evening) "How do we quickly get old values in old data? Business insists."
Do I reply #####@#@!!

Way back in the good old DOS days a replacement for command.com with command history and a batch interpreter

Demo tomorrow. Two devs missing. Six options to be completed. Debugging server crash on another live site.
Is life worth living?

One hour before demo of interface
Me: Let's run through demo
Me: Errors WTF it was okay yesterday
Me: Let's debug.
Debugger: Function module not found
Me: I got error saying module not found
Other dev: Yes we changed the name of function and all arguments.
Client: Waiting for demo
Me:**********CENSORED**********