Excel rant.
I know excel is not a programming language, but it is what I deal with everyday.

My immediate boss is Japanese(Japanese company).

Our boss will occasionally add to the shared spreadsheet without telling us. We find out the next day by discovering that other sheets that reference to it are waaaay off. Or the big one is the mass amount of #ref all over the sheet.

I mean come on man, at least look around the large sheet first!