pay you back

A Doctor opened a clinic & wrote outside the clinic: 
Any treatment will cost Rs.300/- and if we can't treat, we will pay you back Rs.1000/-. 

A CLEVER Man comes to do fraud & thinking to get Rs.1000. 

He says to the Doctor: " I can't feel any taste on my tongue... " 
Doctor asks the Nurse to put few drops of medicine from box no 22. 

After that the MAN shouts: "What the hell ...its URINE!! " 
The doctor says, " Congratulations, your sense of taste is back now ". 

The MAN was angry as he lost Rs.300. 
After 2 weeks MAN comes back again & this time he thinks to get back his previous 300 too. 

MAN: Doctor, I have lost my memory. 
Doctor: Nurse! please put some drops of medicine from Box no 22 on his tongue. 

MAN : Wait doctor, but that medicine is for sense of taste. 
Doctor: Congratulations, your memory is back. 

Moral: Don't try to be over smart with Doctors...