when people say "o'clock" after what time it is. idk why but I just think it sounds so stupid that when people say it I get really annoyed.

I also hate it in class when, if you have been called on and are giving an answer, people turn around to gape at you while you respond. if someone sitting next to me or behind me does I don't care, but it just irritates me so much when people just have to turn around in their seat...ugh!