Today I tested a feature in production that integrates with another system where I fetch how much to delay our data feed for some customers. I kinda remembered we were talking about the delay being an extra 5s but the numbers I got from their prod service amounted to an extra 30s. I flagged it up and it turned out all the other people on the team for the other service simply never checked that they actually input the correct data. Luckily they now have time until tomorrow to fix it.