Me: hi
Person x: looks sidewards and backwards

Person X: can you see me??
Me: y...yes!!

Person X : is there a strange smell from me??
Me: with confused expression... Nnooo

Person X: are you really talking to me??
Me: just nods!

Person X : are you alive??
Me: what????

Person X: because I'm dead!!
Me: have u gone mad??

Me : you are not! See I can touch you!!
Person X: may be you are dead too!!

Me: you are ALIVE.. I can feel your pulse!
Person X: no .. I'm dead, 2weeks ago.. smelling putrefied.. all the insects are eating away me! Can't you see?

Me: I realised he is having "COTARD SYNDROME"