Night flying long haul. Jet lag, always tired.
Most of the fellow cockpit crews are nice people, 90%, then there is 5% weirdos and 5% arseholes.
makes for a long day to fly with the last 5%..
The weird ones can be entertaining: Flew with a guy who strapped a gun to his hip, a clip board to his right thigh, a table napkin to protect his pants from the pesky seat belt, a torch (flash light) dangling from a string around his neck and finally white gloves for hand flying.
Quite a sight, but nice guy, a bit paranoid perhaps and taking no chances in this world.
F/As can be a mixed bag, some are nice and mature, some are drama queens, of both sexes.
I much prefer flying cargo and was lucky to work for an airline that had both pax and cargo kites.