Previous airline:
The Mensa society guy who does the entire interior preflight... his way. Whether you did it or not he does it again his way. While I was on the walk around I was startled by the spoilers raising, never seen that before? Then I come back into the cockpit and he informs me he called maintenance because the HYD SOV wouldn't close when he pulled the fire handle.
You pulled the what!?
The fire handles. When you pull the fire handles you should get a HYD SOV CLSD EICAS message and it didn't come up. He was right, it actually had failed. But man I was perplexed, why did you pull the handle?!
Maintenance gets on board, he explains it to them. They're confused, you pulled the what? So he explains it to them and explains how the airplane works. Lead balloon CRM there.
So they go outside and call their supervisor but then one of them runs over to the next plane and asks "you guys pull fire handles in your preflight checks?!?" No. No we don't. The supervisor comes on board, hangs out while his guys are pulling panels off and in a professional way he starts with some probing questions. As he can tell the Captain is ultra sensitive about Captains authority. He asks how he figured out the HYD SOV was closed. He repeats his flow and pulls the handle. At that moment the other mechanics were elbow deep into the hydraulic junk and a lever moved and about injured the mechanic or worse. Mechanic goes ballistic and an airplane full of 50 passengers got to hear what the mechanic was thinking thanks to the supervisors walkie-talkie. He was actually yelling at the supervisor though. The supervisor just calmly radios back "it wasn't me, it was the Captain..." To which 50 passengers got to hear that their Captain wasn't fit to fly via many many colorful metaphors.
That was the start of the trip.
Between being unable to get him through customs without an interrogation to his hand flying at altitude with the FD's off, I have to say, I was worn out.