They want to use the loo, then take selfies, make a video to send back to friends proving that they are at the game, then they realise that by now the queue for the bar snacks is around the block & they are standing at the back of it - then one wants to call his mum to show her they are sitting in the bar at the table with a round of beers, reiterate what they are doing / having such a great time, then they need to use the loo again, hence returning to seats 10 minutes after the game has restarted.