My biggest annoyance is when people are deceitful/outright lie.  Recently, a man sent me an email sharing about this great video that he had discovered that he thought my  moms would like.  For some reason, the email didn't seem sincere, so I googled the name of the sender....he turned out to be one of the producers of the film short!  Why lie?  I'll never promote that film (which was actually quite entertaining) or anything else from that company!