People who tell me I "need" to do something. It's usually something they want me to do for them and it's never something I "need" to.
Tonight I came home later than usual from work after a very busy day, had to skip lunch so was starving. I just sat down to my tea when the phone rang and it was someone I know telling me I "need" to fix his computer NOW.
Why did I need to fix it? Because he has a virus.
Has he used the AV software I installed six months ago? No, he deleted it because "it went crazy and started loading updates.

Has be been opening spam? Yes because he doesn't know if it's spam until he opens it.
Does he click on the links in the spam? Yes, because he thinks they might be useful.
So why do I need to fix his problem? Because I installed the software he never used and I gave him advice he ignored so I'm responsible.
Needless to say I won't be touching his computer. He's the worst offender when it comes to telling people they need to do something - you need to leave your job, drive ten miles, pick me up and drive me to the job centre, wait for me and then drive me home - Why can't he walk across the road and get on a bus for a ten minute ride into town? It's raining.