"I’m a geophysicist and was working at the time for a major oil company. I was paired up with a colleague who is a geologist to work on a project. One time we were taking a lunch break and chatting about our project when another one of our coworkers, a drilling engineer, sits down at our table and starts to talk to us about the flat earth theory. 

I thought he was joking around at first so I snort laughed. Turns out he was dead serious about trying to convince a geophysicist and a geologist that the earth was flat. We both lost all respect for this idiot that day."