So, I did something dumb today. How much will this cost me ?

I have made similar mistakes when rushing to leave. We have two solutions: first, we now have a thorough checklist that we go over just before pulling out of the campsite. Sometimes we forget to check it, unfortunately.

Second, we loudly remind each other not to rush -- that rushing causes errors. We shout this at each other as we are sprinting past each other to get ready to go asap.