I honestly thought I'd failed my test during it. I can't remember what I got, I think it was something like two or three minors, but I seriously thought I'd failed. Being in the UK, when pulling out of a junction the closest traffic comes from the right, going left. After doing a maneuver in a side street, I was instructed to pull back out onto the main road, turning left, and carry on. The amount of traffic made me hesitate at the junction, and I ended up waiting for about five minutes for a gap that I was confident enough to get through. Gaps were appearing in the traffic, but very rarely, though they were all big enough for me to get through I kept hesitating at each one. I thought that would be enough to fail me (as in the UK, some examiners do actually fail you for being slow like that), but because there were no cars behind me (and thus I wasn't impeding any other drivers in any way) it was only marked as a minor (which is fine) rather than a serious (which is an automatic fail).
I also had some really bad encounters with idiots cutting me up and driving really badly all over the place when I was still learning, including a white van man being a complete and utter retard and almost making me crash during my lesson on the morning of my test. I was really worried something similar would happen during the test, thankfully it didn't. Though after I'd passed I was informed by my driving instructor that his car, which I'd used for my test, had a front light out, which neither of us had noticed before. If my examiner had picked up on that before the test, then it would have counted as a fail for me (though since it wasn't my fault I would have received a refund and a chance to reschedule, unlike if I'd failed during the test proper), so I actually got off pretty lucky there...