I worked at a company for almost 2 years. One day my manager calls me into his office. He asks me: "Do you like working here?" I pause for a moment, then respond "No. Not really." He then says "Alright then. You are fired."
In my particular situation, I pretty much knew what was actually going on and why. I could have handed him a letter of my two week resignation instead of going through the ridiculous charade of "do you like working here?" There is good reason why people hand in resignations before asking for the details. The chance that you will get suddenly terminated for no apparent reason is very real.
Was I fired for a valid reason from the company? Nope. My performance reviews etc were very high. The manager just didn't like me and the feeling was mutual.
As another example, if one is not enough:
Another place I worked at, also for almost 2 years. I work there through a consulting group. One day my consulting group handler comes to the office and says we need to talk and asks me to come to lunch. No notice before he showed up. After leaving the secure facility, he asks me for my access card and informs me I have been fired.
I ask why. He says that no reason was given. I keep pestering the guy, who I know fairly well, to try to get some sort of explanation. Eventually he says that the only explanation he was given is that the company said I am too smart. He said it doesn't make any sense and he doesn't get it either. To this day I don't know why I was let go from that position.
If I'm at a job and things look like they are going sour; it is time for hardball. I assume that I could be fired at any moment at all times, and I make sure I am prepared for it.
You think "Two weeks is bullshit"? Two weeks is generous.