Have you ever been to a party where one person has ruined the whole thing by being a total a**hole, even if he didn't realize it? There are certain things you just don't do at a party, unless you have no regard whatsoever for your fellow guests or hosts.

You don't bring an extra person, unannounced, to a dinner party, for example. The host has gauged how much food to make based on the RSVPs. Bringing an extra person without warning is impolite and potentially very stressful for the host.

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You also never, ever, ever want to double-dip.

What kinds of party fouls are you making without realizing it? Are you unknowingly a terrible guest? Take this quiz to find out. Maybe you'll start getting invited to more parties.