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Sheogorath's Uncle Leo - Seinfeld easter egg
So this is not a spoiler really but during the mage's guild quest line Sheogorath tells the story of his Uncle Leo (which is quite disturbing!) and gives you a task to perform. All Seinfeld-fans will immediately associate this name, and perhaps also somewhat his story (you're an Adonis!) with Jerry Seinfeld's uncle Leo who is a quirky but still somewhat lovable character on Seinfeld.
Now this is not the first time Elder Scrolls has a Uncle Leo reference in the Shivering Isles. In the expansion to Oblivion there was a character in Crucible that had her Uncle Leo living upstairs in her house, he was a zombie.
uesp.net/wiki/Shivering:Easter_Eggs