So we had an employee at my work who, about two weeks before I was promoted to my coordinator position, stopped coming in. He was a pleasant enough guy, though he could sometimes get very impassioned about some contentious issues like politics or religion (we've a very open office culture, though, no offense was ever had, I don't think), he had a great sense of humour, but he was terrible worker. I guess he's quite popular on... Twitter. So he'd spend a lot of time updating his Twitter account. He'd watch Simpsons episodes on YouTube while having tweet-conversations with the Simpsons writers, many of whom he had met after interning there.
It'd take him an hour to get a coffee.
It bugged me a bit, but generally speaking it wasn't my concern as I wasn't in charge of him or anything. It became my problem when I was asked to do the review of his work (we do data entry, and everything has to be reviewed and corrected: this is usually cleaning up typos and such) and I discovered he had a myriad of procedural problems and instead of the occasional typo, I'd find... dozens. Maybe hundreds in a single data file. It was extremely frustrating. I can't say I missed him when he stopped showing up to work.
Now, I am coordinator of our project. And I have discovered that all the corrections he said were made, were not. And I have hundreds of pages of source material to check against the data he entered, fixing every frustrating mistake.
Shit.