Yeah, I had to explain to a client once that our new version of their analytics query produced different results because their original SAS code didn't mind ref

Yeah, I had to explain to a client once that our new version of their analytics query produced different results because their original SAS code didn't mind referencing variables before they're declared, and so one of the numbers in the analysis used to always be 0. They did NOT appreciate hearing that they had been running a bugged query for years...