Respected Doctor, I have my nephew who has got a unique habit of sprinkling talcom powder all over the floor of his room and after that he drived himself onto the powder only to have him slipped right upto the facing wall and gets smashed onto it-injuring himself every time he acts alike. On being asked he answers that he gets rejoice in his mind on doing so. I am afraid he has got a problem and needs to treated immediately.Please help.I have given my mail address below. With regards. Yours, Amar Poddar,Asansol,Dt: Burdwan,West Bengal,India.