Probably not the most awkward, but worth a mention. One time I got to a drama lesson (year 8 or 9) and saw a notice on the door about a change of room for that lesson. I read it and then went to the room that the notice said the lesson was in, but no one was there. I looked around for a bit and then went back to the drama room to see if the room was correct.
The rest of my class was in there and the lesson was at least quarter of an hour in. The lesson had been in there all along and I had misread the notice, which was for a different class. It was a bit embarrassing to arrive at the class late and have to explain that it was because I'd been an idiot and misread the notice.
When can you expect yours?