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Make a SAN check; on failure lose 2d10 SAN and develop a temporary insanity for the next scene.

Alternately, gain Emotional Hardening until the end of the session and take a penalty to all social checks due to alienation.

Your choice.

HAH! Oddly enough; I wrote an article under the influence of Lovecraft the other week... I make a point not to read it during my shifts, but instead I went to bed listening to an audio book prior to the shift. It had the same affect I'm sure.