Nick name thread and why

When I was at the Post Office in AZ the one of the ET's gave me the name Doctor Destructo...every stamp canceling machine I got on suffered damage of some sort. The old Micro Mark is where it started. Had this little part called a dog bone. Took a good hour to replace it. Then another 10 minutes of tweaking to get it running. Mechanic had not even got his tools all put away and he had to replace it a second time.