Has anybody noticed that when a sci-fi show does a time loop episode, it always turns out to be great and often considered one of the best from it's respective show? We have 'Cause and Effect' from TNG, 'Monday' from The X-Files and 'Window of Opportunity' from Stargate. I can also remember similar episodes from Buffy and Xena. Can anybody think of any others? Is this type of episode getting old or are they the type that remains great no matter what?