I dont do SM, so I can't participate but there's no better place to share your favorite Morrowind memory than the ESO forums.
I gotta say it's the Fargoth loop. An open ended morally deep quest that reveals the kind of person you are. I would always rip off Fargoth, his bully and his only friend the whole world to get off to a great start. Of course that's not the only way to end that quest, just the most beneficial for yourself (and it's not even an official completion)
In 20 years of Elder Scrolls content since I still think it's the best conceived quest of the series.