There are strong taboos about touching in the workplace, and occasions when physical contact is regarded as appropriate are few and far between. The only sort of physical contact we can observe regularly is a handshake, which is a conventional business greeting following strict unwritten rules regarding duration, degree of strength employed, and permitted degrees of moistness of skin. During a number of encounters the good manners of certain individuals are overridden by their desire to dominate* the new acquaintance, a potentially dangerous impulse which can lead to crushed knuckles. 

*good manners are overridden by their desire to dominate: We have also seen this on Alioth where the conventional form of greeting (the greeter places the third set of legs behind the first set of legs of the greetee and pushes lightly) may result in the dismemberment of one or both of the creatures if one of them decides it wants to make a strong impression on its counterpart and presses a little too strongly.