You wake up and head to the bathroom. The door is locked, and your sister has just begun taking her 30-minute shower where she'll sing loudly for the whole house to hear and use up the last of the hot water. You go to eat some breakfast first instead. You pour a bowl full of cereal and open the fridge to grab some milk. Upon picking up the carton, however, you realize that there’s no more than a drop left in it. No problem, you had leftover pancakes too– Oh! Just kidding! Your sister ate those too and left a note in their absence detailing how delicious they were and requesting that you pick up milk on your way home from work.