"The clinical technicians who prepare cellular material for bone marrow transplants.
I worked at a major cancer treatment center across the hall from the lab that did this. They slipped up once and gave the cells for one patient to a different patient. Both patients died. One from being given incompatible cells, the other from not receiving their transplant in time after their radiation treatment.
Lots of pain for everyone that day. Imagine losing your job because you killed two people."
In my country the only qualification to be a roofer is meth and mountain dew. Or an illegal Mexican immigrant. The Mexican crews don't mess around, they get that thing put on in no time. Same with brick layers.