We were on a flight to Alaska several years ago that had to go back to the gate and everyone had to get off due to a weather issue. They stated we would reboard in about an hour but they started boarding about 20 minutes later. Many announcements were made but when we took off less than half of the people that were originally on board were on the flight. We never leave the gate now. Even for delays we show up at the original time because I don’t want to be left behind!