A: Our patented 3-2-1 method: Invite yourself, arrive uninvited, and bring a keg.
Learn more about the 3-2-1 methodA: Develop a good poker face. Or just blame it on your roommate's dog.
Read our guide to crasher etiquetteA: Only if they're having a themed birthday party for adults. Otherwise, just stick to the grown-ups.
Crash parties with kids: The art of subtlety