Allie takes Ryan's pants off leaving him writhing on my floor in front of all of his friends in his Tighty-Whities. Yikes. After all of this, Allie left (as did about half the party because they were traumatized). But anyway, the hardcore friends stuck around and we still had a great time. (largely in part because of Matty who kept the music coming. Thanks Matt.)
Here we see that Allie has already left Jess behind and moved on to Ryan (seen here wearing his very special birthday boy hat compliments of Karen Landis.) Ryan wasn't expecting Allie to start dancing for him and was pretty embarassed. He didn't realize at the time how much worse things were going to get. (and neither did we.)