Here's the basic idea: It's a small, featureless 5x5x5m cement room with one door. If two people enter that have similar opinions/beliefs on what is offensive or not, they interact in a friendly-ish manner and then leave. If they have different ideas on what is offensive, then the room locks itself and manifests an entity (SCP-x-01) that appears/acts in a way that would deeply offend one, but not both, of the subjects. The two subjects then have an argument that always ends with one person getting killed. When they die, the door unlocks and the other is allowed to leave.
The test logs would make up a large part of the entry. Some ideas I'm thinking of:
A KKK member vs. an African-American (-01 takes the form of the KKK burning a cross)
A nudist vs. [can't decide how to phrase "an anti-naturalist"] (-01 appears as two nudists)
A devout atheist vs. a preacher (-01 appears as a pushy religious person who tries to convert the former)
A devout atheist vs. a preacher (-01 manifests as a group of atheists doing anti-religious stuff)
A "Sizzling Cinnamon" jelly bean vs. a "Very Cherry" jelly bean (-01 does not appear)
It probably needs a lot of work, but that's what the forum is for, eh?