In case you did not see the episode yet, I'm gonna tell you the three reasons. Don't worry, no spoiler involved.

1. It contains the probably funniest single scene which also completely summarizes the relationship between Leonard and Sheldon. 2:01 to 2:05, right before the theme song.
2. It is the only episode where Amy is kind of cute mostly due to sitting on quite low chairs in most of her scenes.
3. It was necessary after the lame launch of season 6.