I once had an appointment for an ear doctor (about 1970) that I picked out of a phone book after experiencing very bad hearing following a shooting experience where I forgot to wear hearing protection. Setting in the waiting room I noticed I was the only one there and they took me right away, (15 minutes early). When in the examining room I notice all his equipment which is usually stainless steel was painted over with what looked liked a paint brush in green paint. The doctor took a probe out of a container and looked into my ear then put it back into the same container with all the other probes. I couldn't wait to get out of there.
Sometimes it's nice to know your doctor is busy because he is good.