Stan Bennett is incredibly frustrated with the world, the people that inhabit it and the endless social rules he has to follow. Instead of voicing his opinions and tackling the 'system' Stan keeps all his frustrations, all his anger, bottled up. We see, through Stan, the rules society have to follow and the humour comes from Stan's complete inward frustration compared to his pleasent exterior persona.
He believes there is a way you should behave in a lift, as he calls it - 'Lift Etiquette'. Stan thinks you shouldn't have to ask someone how their weekend was just because you work with them. He is a firm believer in not being disturbed when going to toilet. All of these rules which Stan has such strong opinions about, get broken, every single day. Rather than fight it, Stan accepts it - despite every part of his body wanting to to rip up the rule book and create a new set rules for society to follow. The audience watch Stan struggle with social convention and watch as he slowly attempts to break free from the Social rulebook.