I hate being asked to rate my expertiese in certain things as Beginner, Intermediate or Advanced. How am I supposed to know whether there's more to learn if I haven't learned it yet?
This doesn't apply to my current job, but my old one. And also the process of applying to jobs and being really apprehensive about potentially overselling myself. Luckily, I didn't, and now my life totally pwns. But MAN every single application was like a miniature gran mal seizure of panic.