you get to an Off-Topic thread that piques your interest and you realize it's been months since someone last posted in it?
Yup, that annoys me because I feel like I can no longer post on it, or if you want to comment on it and then you realise its been locked. It also annoys me when a post has waaay too many replies to sift through, as you might miss some interesting comments you'd like to reply to.
This forum isn't too bad, but I hate it on certain forums when they're being ran too harshly and strictly by the moderators, not allowing people to hold proper discussions - after all, isn't this the point of the forum. Certain people also get way too wound up when a post has been placed in the wrong section. I mean ok, if it's obvious like putting a music related thread in a movie section, but other times it can actually be quite hard to decide where something should go. Sometimes it can just be a simple mistake.
Oh and just to reel off a couple more and then I'll stop complaining. I hate it when people can't take part in simple debate without taking it too personally and getting immature, and people who use too much txt speak making it really hard (sometimes impossible) to understand.