Things that make me crazy on Ebay!
Item #1: When international bidders bid on your items without asking, and when you've indicated that you don't accept international bids.
Which, of course, just happened on one of my auctions. The bid was from Brazil, which is a place I haven't shipped to before and don't want to. If the bid had come from England or Japan, I might have made an exception.
I know that opening auctions up to international bidders is supposed to increase sales. I understand that and sometimes for certain types of items I do open things up to Japan. But overall, I have found international sales to be a pain in the ass.