[quote=@Lady Selune]
Here's mine: set up a giant, flat, circular world that is held up four elephants standing on the bag of a giant space turtle. Other than this anomaly, it follows all of the rules that a normal planet also follows, and is entirely unique. Seed and uplift life on the planet, watch as they get just [i]so[/i] confused at what screwy planet they'evolved' on. Bonus points for leaving religious texts detailing a God-like being called 'the Pratchett' that controls every aspect of their lives in subtle ways.
[/quote]

But what if they read disk world already?