I don't take a lot of classes, but have been an instructor as well as a student. What gets on my nerves are students and/or instructors who take up way too much time with personal anecdotes while we all sit around waiting for the next instruction. Been to classes for several hours when, if we could just stick to the subject, could have been done in half the time. I don't want to be a wet blanket, but sometimes a little moderation is in order.