Ah the power of two. There's nothing quite like it. Especially when it comes to paying utility bills parenting cooking elaborate meals purchasing a grown-up bed jumping rope and lifting heavy machinery. The world favours pairs. Who wants to waste the wood building an ark for singletons?
In a sense it might even be said that our failure is to form habits: for after all habit is relative to a stereotyped world and meantime it is only the roughness of the eye that makes two persons things situations seem alike.