Tl:dr Guy acts like a moron and is useless in group tasks.

In my class there is this one guy, that I'll just call carl. Now Carl do some stuff that irritates me, but is harmless. Things like repeat the answer he get's every time he asks a question. I fucking hate it, but it's okay. He also says some pretty stupid stuff. Like today when he asked why Ubuntu started when he turned on a computer, the guy next to him simply said because it's installed while I facepalmed.
Carl does even worse things than that. I was asked to work with Carl on a group task.
Now I hate talking in front of people, so we decided that I would do the writing and he would speak to the rest of the class.
I made a word document containing what he had to say, but we also wanted a PowerPoint presentation to make it look better and so the other could get read the basics on what we we were presenting.
Carl decided that he could create the PowerPoint presentation, and I thought why not. The thing I didn't expect was that Carl would install Ubuntu on his laptop, without saving the presentation somewhere else. In other words HE FUCKING DELETED IT.
But it's fine he could just create it using a program that isn't PowerPoint. OH WAIT OF COURSE CARL FOUND A WAY TO TO FUCK THIS. The next time we had that subject he came without his laptop (we use our laptops in all our courses) because he managed to make it unusable, although he fixed it a few days later.
At that point I said fuck it and created the presentation myself.
At this point I didn't trust Carl with anything sharper than a spoon and decided, against our previous, plans to present it with him. Now I sent him the Word and PowerPoint documents so he would now what to say and what the class was going to see.
THIS GUY DECIDED TO JUST READ WORD FOR WORD OF THE POWERPOINT AKA NOT THE THING I ASKED HIM TO DO. So half the the time it was me going into slight detail about advertisement on the net and how people finding your company on google helps to sell products, AND THE OTHER WAS HIM SAYING A FEW WORDS. JESUS CHRIST, Carl basically didn't do shit yet he acted like he did. That's something that really makes me mad.