Human Nature. When you feel that someone’s been intentionally mean to you, it’s natural to want to retaliate.
That’s why, when you’re chasing slow payers you have to be EXTRA, extra careful with the words that you use and the attitude that you show. This delightful true story regarding exams at Cambridge University illustrates the point well.
During an examination one day a bright young student popped up and asked the proctor to bring him Cakes and Ale. The following dialog ensued:
At this point, the student produced a copy of the 400 year old Laws of Cambridge, written in Latin and still nominally in effect, and pointed to the section which read (rough translation from the Latin):
Three weeks later the student was fined five pounds for not wearing a sword to the examination!!
click here for another example.