A Good example !!

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 class by telling two important qualities as a Doctor.
 

The 1st is that NEVER BE DISGUSTED FOR ANYTHING ABOUT BODY,Dog
e.g. 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 minutesBut 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.