Where, if you touch a car at the wrong time, you suddenly/instantly die. And I'm not talking about the car exploding mind you. I'm talking about simply coming into physical contact with it, having it visually shift a little bit, then suddenly you keel over and die.
It's happened to me about 3 times now. (over the course of a lot of hours mind you) And, the total amount of progress I've lost on these 3 occurrences just REALLY pisses me off when I think about it, especially on this latest one.