1) More than one woman has used me, without my knowledge and permission, to explain to her husband where she was (or who she spent money on) when cheating on him. Then the husband hates me and puts an end to my friendship with her.
2) Theft of Intellectual Property.
3) Those who think that when they read the words "Confidential" on the top of the letter, it's time to immediately gossip the contents. You know who you are!
