Missing More Than Digits

We have a gentleman that has been visiting the library frequently.  This guy is waaaaay beyond schizophrenic.  He also happens to have just one hand that likes to talk to what used to be his other hand.  They have full blown conversations between 'Mr. Left' and the stump that used to be his right hand.  He'll say things like "Mr. Left is having anxiety today because he thinks that he's gonna end up like 'Mr. Right'."  Unfortunately, 'Mr. Left' got caught man-handling his 'third arm' in the bathroom one day for all to see.