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Sentimental Value.

Seems like memories never fade away and just catch up to you, don't they?
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-MADE USING HMW 1950's STYLE MOD-
Storyline:
You fall asleep into the dark abyss, then wake up in a familiar test room, like you've done it before.
Wait.
Hasn't this already happened?

Edit:
This takes place in an abandoned chamber made by Cave Johnson, but no one could test it so they shut it down along with the other chambers.