I see. [His jaw tightens slightly.] That is not known of within the terms of willing possession among my family, but I would not want others to assume such a thing. Mental illness should never be used for entertainment. I agree we should avoid any implications entirely.

[The very thought makes him tense and unhappy.]

We can use much simpler effects, or ones that are hard to prove. Blurred vision, headaches, chest pains and the like.