Even more annoying ..

are orgers who post in classified and a) don't bother to answer queries or b) don't read the instructions shown on a bright yellow strip across the top of every page for removing threads when an item is sold or whatever. I've lost count of the times I've seen something sold ages ago with a comment saying Sold - please remove or some such. Do they really think the Mods spend their time trawling through looking for unwanted threads? Fed up with looking at something I want only to find it's long gone. It's so easy to do what it says - report post. What's the problem?

Second that.

It is annoying when you enquire about an item that someone has advertised for sale and the don't even have the courtesy to reply.