Proctologist joke

A proctologist just finished examining a patient and said "good by Mr. 
Smith, see you next week".  The nurse walks in a few minutes later and 
has a form for the Proctologist to sign.  The nurse sees that he is 
trying to write with his rectal thermometer and informs the doctor of his 
mistake.  He exclaims "oh man, some asshole stole my pen!"