The hilariously funny, but unexpected and uninvited, Cousin Eddie and Catherine in National Lampoon's Christmas Vacation.
In the hustle and bustle that is December for many of us, it is worth remembering this tiny tidbit of a social grace, which average guys attempting to kick up their everyday style several notches should do their utmost to remember. Don't drop in on people unexpectedly, and don't try to wrangle an invitation. If people want to see or include you, they'll let you know with a phone call or an invitation. You certainly don't want to add to anyone's Holiday stress by crashing the party uninvited. It's high time to think of others and, hopefully, consider how your choices and behavior might negatively affect them. Even if they are polite enough to say nothing about it. Know what I mean?