One of the big rules at my shop is if tools are left laying on the trailers when they leave the shop expect that to be your last day. Today I was parting out reach in coolers on the trailer and left a screwdriver sitting on a tire. As soon as my helper started out of the yard I heard a bang and saw the tire go down. Went over and looked, saw my screwdriver sticking out of the tire! A little bit of a grey area because the trailer didn't make it all the way out of the yard. Maybe I should just write myself a warning slip this time. What do you think?