You don't even have to explain yourself; it happens. We've all been there, an hour before we're supposed to show up to our buddy's Halloween party, and we somehow don't have a costume. Not even a store-bought one. Not even the one you wore last year. But before you panic and call in sick, know that even the most prolific procrastinators have access to recognisable, clever costumes using stuff you probably have in your closet and on your desk.