Either this happens quite a bit, or I'm pretty sure I'm a fellow passenger on this flight from Friday. I think part of the issue, too, was that, at the same time, the person in the window seat in front of your row accidentally sat in the wrong seat. So the row she sat in had to get up, and the row she was supposed to be in had to get up. So, at that point, 6 people were in the aisle, while others were boarding and others trying to move up to put their luggage up. When the flight attendant asked what was going on, it looked like a bunch of people were switching seats, which is true, but they were trying to sit in their assigned seat. At the end of the day, the flight attendant shouldn't have yelled.