Poll Suggestion: Catch the Egg! TV Series Edition

Intro: 

This is about easter-eggs in TV Series.
Which easter-egg is the most surprising or entertaining?

For discussion, please ckick here.

Suggestions: 

Please suggest with title, which means season and episode and please (!), as I probably don't know the content of the episode, give a brief description like I did in the first option. Thank you!

List: https://www.imdb.com/list/ls596897420/

Poll: Pending, searching for eggs ...