Semi related but in the opposite direction:

I know a PE who worked for a local trash disposal service* many years in the past. He always put something like "waste disposal and processing engineer" on his resume and mads it sound like he was dancing around the fact that he was a garbage truck driver. His clients would always ask about it as if he was a truck driver since it looked like an oddball in the context of his resume and he loved saying "Well no, I actually designed the facilities."

*Turns out low margin industries employ a surprising number of PEs so they can rubber stamp all their facilities projects in-house without getting bent over by whatever PE firm(s) is buddy-buddy with the municipality(s) they're operating in