Its my favourite episode of the first series and is very funny and emotional. I love all the parts where booth is stoned however it is also quite series as you learn more about the characters families and past as well as some of Brennan's memories of Christmas. My favourite scene is at the very end when Brennan opens her Christmas present from here parents for the very first time. I also like it when the exchange presents from their secret Santa's, as it is the first time there is a small connection between Hodgins and Angela. (I'm also very happy there was a firefly comment since i am a huge fan.) Its a good episode that is both sad and happy at the same time.
