[quote=njtosd] I personally had not heard of anything like this before.[/quote]

Risky Business
Sixteen Candles
Project X
American Pie
Superbad
House Party

Teen house parties going amuck while the parents are away were in all of those movies. Maybe word of mouth didn’t spread via craigslist/facebook/twitter, but there have always been ways to spread it.

When I had teens at home and my wife and I were going to be away for the evening or weekend, I would go talk to the neighbors and explain that we were leaving a teen alone and that if ANY strange cars/people came by the house, to give us a call. So I knew about the possibilities even back then. We didn’t want to come back and find Animal House in our living room.