When you finish talking to someone on the phone and have said all of your goodbyes, do you hang up immediately? Do you check to see if the other person is still talking first? If not, do you ever think the person is saying goodbye or whatever, and they look down and sees you’re not on the phone anymore and gets pissed? I think they might. So, now I say bye, pull the phone off of my ear and give the person a courtesy wait of a few seconds before hanging up. This lets them feel good that they didn’t get shorted on their farewell. I’m just a good guy like that.