The worst boss and human being so far, still wondering how he keeps the company afloat. This was my first longterm developer job almost a decade ago and I was a student at that time. The application was an outlook plug in for a document management system.

Scene 1:
Boss: The processing is too slow. Make it faster.
Me: After analysis and profiling I can prove that the core (developed in VB6 by a physicist and autoconverted to VB.NET) is the bottleneck.
Boss: I don't care. Make it faster and don't touch the core.

Scene 2:
Boss: I want the app to behave in that way.
Me: This is not what we specified previously. Look here. Nonetheless, I would have to rewrite half of the plugin. Mind that it is an outlook plug in and we are restricted by outlook. If you want that, it would take XX days and we do not have enough time until release.
Boss: I don't care. Do it. And the deadline stays as it is.
Boss 2 weeks later: I don't like it.

Scene 3:
Me: To release in time I need more resources. I need at least one tester and another developer would be a huge plus. Also, I need a second PC for testing.
Boss: No.
2 weeks later:
Boss: why does it not work properly in outlook 2010? Didn't you test it?
Me: I could not. I have only outlook 2007. I asked for more resources and did not get them.
Boss: it's your fault. Bad work.

Scene 4:
*Me having failed multiple exams, stress at work, started to drink*
Boss: Don't you like working here?
Me: ...

Finale:
*Me getting written sick with severe depression*
Boss: fires me.
Me: Loses flat. Quits uni. Unemployed for 6 Months, one rejection after another (boss was phoned, that's sure). Moving back to parents. Sues boss. Gets money.

I still hate him and wish him the most painful experiences in life. Such people belong behind bars. But the justice isn't always served. One has to move forward and improve himself.