In the old days, Halloween was simple. You threw a white sheet over your head, grabbed a grocery sack, and hit the streets in search of plunder. Like everything else these days, however, Halloween has grown increasingly complicated. But while Halloween-at-work, candy-buying decisions, and last-minute costume quandaries may scare you more than any John Carpenter movie ever did, fear not! Our new handy Halloween etiquette guide is here to protect you.