At some point in everyone's young adult life, they will be called upon to behave like a Serious Grownup, even if they are not actually grown up in by any reasonable measure. And then they will smile and nod and kind of laugh hysterically on the inside, because it is hard to believe that anyone is actually entrusting them with this level of responsibility.

It is important to keep these though on the inside, however, as the most important rule of pretending to be a grownup is to fake it till you make it.

Or more failing that, just to fake it.