Also, if you put your coat in the overhead bin, it gets taken out and burned.
Speaking of that, wait for the FA to say "Our overhead bins are full, we need to start checking bags."
Well, imagine if everyone in green is good, no bags to check. All the seats in blue are already occupied by people who put their bags in overhead bins. All the people in red have bags and no where to put them.
So all of their bags have to come back out, be checked to the next hub (let's be honest, they're lucky if they're checked to the final destination and don't end up twirling around baggage claim), and then they continue back to their seats. All in 47 minutes which included unloading out of 1L door and waiting for wheelchairs.
Yes, boarding is going to be a blast. Much like, sigh, the 88 and 90, just more people. What we need to do is open one of those aft doors and just start throwing bags down to the ramp.