Indian men may engage in friendly back patting merely as a sign of friendship. The left hand is considered unclean. Do not touch anyone's head. The head is considered sensitive. Feet are considered unclean.
Feet are sacred for holy men and women.
Pointing footwear at people is considered an insult. Indians are very sensitive to being beckoned rudely. To beckon, extend your arm, palm down and make a scratching motion with fingers kept together. Point with your chin, whole hand or thumb. The chin is not used to point at superiors.