My pet peeve is people who think they know about a subject you are something of an expert in, and tell you things in such certain terms that there is absolutely no point in trying to argue. My friend told me that pointe shoes had blocks of wood in them, and when I said that they didn't, she said "well they used to when I was young" (i.e. 15 years ago) in such a way that I couldn't contradict her. Another friend was telling me all about nuclear power and how her dad (who is a medical doctor) said this that and the other about it. I have a DEGREE IN PHYSICS but apparently I know less than nothing about the subject. That one actually isn't a peeve, more of a thing which makes me so cross I have to leave the room and calm down.
<P>Other peeves - the sound of people typing loudly especially when they hit the enter key really hard (like that will make the data go in better). And the sound of people eating with their mouth open, smacking their lips, etc. <P>And now I have made myself sound like a lunatic, so I will stop now. I think I am turning into Victor Meldrew in my old age.