Regarding the lead masks case, how about: Two guys were interested in taking some weird drugs (equivalent of "shrooms" today). They met someone who agreed to give them the drugs, and as part of the ritual gave them the instructions "Be at the place arranged at 16.30. Take capsules at 18.30. After feeling the effects, protect half the face with lead masks. Await the agreed signal"[0]. They took the drugs, OD'd and died.
[0] http://en.wikipedia.org/wiki/Lead_Masks_Case