AnomalyOPEN
Think of the globe you grew up with, at home or in a classroom. From memory only, before checking anything or looking anything up: describe what the very top of it looked like.
Blind experiments
A case is a question about a shared memory, collected blind: nobody sees anyone else's answer until it closes. Then the group is measured for whether people described it in their own words or in the words of a version they read, and the result is published whichever way it comes out.