Observation & Paying Attention

1st Year Students of MBBS were attending their 1st anatomy class. 
  
They all gathered around the surgery table with a real dead dog. 
  
The professor started the class by telling 2 important qualities as a doctor. 
  
The 1st is that NEVER BE DISGUSTED REGARDING ANYTHING ABOUT BODY, & he
inserted his finger in dog's mouth & on drawing back tasted it in his own mouth. 
  

Then he said them to do the same. The students hesitated for several minutes, but eventually everyone inserted their fingers in dog's mouth & then tasted it. 
  
When everyone finished, the Professor looked at them and said: THE MOST
IMPORTANT 2ND QUALITY IS OBSERVATION, I INSERTED MY MIDDLE FINGER BUT
TASTED THE INDEX FINGER, NOW LEARN TO PAY ATTENTION. 
  Moral: Life is tough, but it's a lot tougher when you are not paying attention