Way too often. One of the bugs I had the opportunity to debug was caused by a frontend developer who copy pasted invalid JSON from SO and pushed it all the way

Way too often. One of the bugs I had the opportunity to debug was caused by a frontend developer who copy pasted invalid JSON from SO and pushed it all the way to production. He used different quotes: “ ". When the data did not show up on the dashboard he just put the blame on the data team.