Unilateral Pains

In the Navi Mumbai Municipal Hospital , where we are posted during our MBBS course .
Time - 9.30 am on Thursday morning , waiting for the Doctor to arrive ......
Poor Atul has just rested his 'oh so painful ' right side [ courtesy of a Tetanus shot 2 days earlier - we all sympathise ] on the chair . After a few minutes of harmless conversation , he gets up to leave the room . As a continuity of the aforementioned conversation , Amod whacks him hard on the LEFT side ... Hilariously Atul clutches his right side , moaning and groaning !! and Amod actually explains the difference between the right and left parts of his posterior - to which poor Atul gives the Tetanus shot ka explanation .....
After he leaves the room - Amod gets up - puts on a serious elderly doctor look and gravely starts off -

" Patient has come with complaints of Unilateral Bum Pain on the Right side . It is aggravated by hitting on the left side . He also gives history of tetanus shots taken two days before arriving in the OPD today ....."

Unfortunately Amod was unable to give his ' Diagnosis ' as we were all laughing hysterically by then .......