Off-Topic: How an idiot ruined my day (and probably more than one)

They are depriving some village of its idiot. 

I'm sorry, but I'm not going to make a gold-related post today, since I'm too angry for what just happened to me.
I had an exam (I'm studying Physics at the University, I won't say which one), a stupid exam of Analysis. I already passed all the physics related exams, and I need to give very few exams before I can get my bachelor degree.

In the same room people where giving two different, but very similar, exams (two questions out of three were identical... they basically are the old and the new version of the same course). The professor gave to each of us 3 exercises, asking to each one what exam he/she was going to do. I clearly stated what exam I needed, but he mistakenly gave me the wrong exercise.

I didn't notice it, since there is no clear way to see the difference between the two.
It was a "strange" exercise for the course, and I was quite sure the thing that was asked in that exercise wasn't in the course... But since my professor isn't the sharpest knife in the drawer, it would not be the first time he adds something we never done in one of his exams... And you can't make him reason about it.

So I stupidly tried to do the exercise (It was something I had done in another course, some years ago... quite rusty in my mind, but with some time I was sure I could do it) before finding the official... uhmmm... "program of the course"? "list of subject of the course"? I don't know how it is called in English. I had printed it in a flash of genius exactly to contest problems like that.
This happens after one hour and an half (I did part of the other two exercises in the meantime). The total time we had were three hours.
I suppose I lost half an hour because of this error the prof. made.

I finally get the real problem I had to solve, and I do it fast. I get back to the other two, and things go quite well... But I'm a bit late with everything. In the last minutes of the exam I ask him if I can get 10 minutes more, since I lost time due to his mistake.
And... He actually didn't understand what I was asking.
He told me "all the other students are giving the completed exams now, it cannot advantage you over them giving you other ten minutes" (well, this is a bit of stretch in the translation... the actual words were more like a mumbled "there are also the other students", but the meaning was this). I tried to explain again, but he was clueless. I didn't get my ten minutes.
Afterwards, in the same instant I got out of the room, I realized that in the last minute of the exam I made a mistake because I hadn't the time to double-check part of the text (I remembered a vector wrong... It was written (-1,1), I wrote (1,-1)). This error alone will count a lot on my final mark, since it led me to wrong results.

Now, this is it.
Let me just rant a little more about this poster child for birth control, so you'll see how he actually is just one IQ point above brain death.
Our University asks to all professor to fill some paper about their course, which then gets published on the website of the University. Things like the office number, the subjects touched by their course, the hours in which it will take place...
One of the question is "What are the expected learning results of the course?"
The answer should be a concise summary of the subjects, pointing out the more important ("The students will learn how to do <this> and <that> and will know about the existence of <this other thing>"). My prof answered:
"adequate."

Ah, I must admit that writing this post I used a lot this "Not too Bright List", which I found googling "sharpest knife in the drawer" (I wanted to be sure to say that right)... It's quite funny, go see yourself.