Ryan and Taylor decide to take a New Years Eve trip to Las Vegas, only Summer and Seth spoil their fun by insisting that they tag along. During the trip, Taylor begins to wonder whether Summer may be pregnant from her recent trysts with Seth, while he discovers the home pregnancy test in Taylor's purse and jumps to the wrong conclusion. But things take a turn when Summer's purse is stolen and the four of them end up at a rave populated by people dressed up as aliens to search for the purse sn ...[Read Story ]