Saving the best

My wife and I own a TiVo.  There are two television shows that we do not delete in the event that we want to watch them again and again (which we have been known to do):

Once More with Feeling, the musical episode from the television series Buffy the Vampire Slayer.

Niagara, the episode from the television series The Office in which Jim and Pam are married. 

They are two of the best episodes of television ever produced.