The thing that absolutely does my head in is when friends/families have problems with their network/computers/tablets/phones/other and ask me to 'sort it out'
I ask them to hang around as usually there are several things they need to do - logon, enter passwords, confirm actions etc.
Then when you are there beavering away, they are doing other stuff, so you continually have to stop and get their attention as they are 'tidying up' or hanging washing out or cooking or whatever
In future, to save myself annoyance I think I'll insist that people get all their passwords into order and logons into order and are prepared to sit there for a couple of hours while I help them.
I find it astonishing even now that when I say "OK. I need to logon to this now, what's your password" and get "Dunno" or "Er. I have it somewhere, probably.."
Usually turns a job that should take 5 minutes into something that takes hours and hours and pisses everyone off.