Current place I'm in has a particular SUE who goes out of her way to make sure her IT doesn't work in order for her to not work - but blame IT for it.
One day she had another issue - she had forgotten her password although was adamant it was correct and it's the c0mPUteR's fault - and her manager fully believed it was a problem with the laptop. I was rather pissed off with her shenanigans so I said to her in ear shot "the only problem with that laptop is that it has a PICNIC error".
"How do we fix it?" he asked - short of saying sack her for being a lazy bastard I said "there isn't a fix, she'll just have to remember her password. If she's not done it in 15 minutes I'll unlock it".
The problem was during those 15 minutes, her mate asked her what the problem was and she said "It's a PICNIC error apparently, whatever that is". Another colleague then pipes up "Hang on, X has that on the mug he's drinking out of".
So the three of them have a look at this lad's mug which cheerfully breaks it down to "Problem In Chair, Not In Computer".
It's been 9 months, she's not spoken to me since but curiously hasn't had an issue with her laptop either.