Could it be that the christmas episode sparked a little love flame between Fry and Leela? They seemed to "enjoy" each others company and when they were under the missile toe it looked as though it was about to get really intimit untill "Santa Clause" shot T.O.E. Misslies at them. All I'm really saying is that could it be what we've all suspected- love?
Your secret Santa, The Internet Seeker