I had a home birth for my second son and got no sleep at all the night he was born. The next evening a "friend" (at that time childless) turned up and just stayed and stayed, despite the fact that I was almost out cold. My mother was there, sitting on the sofa and glowering at her, dropping hints that we should all be in bed but nothing worked. Eventually she left after 12am. I don't think my mother ever forgave her.
At one time she developed the habit of dropping in around supper time on Fridays, and always ended up eating with us despite the fact that, with two small children, any quiet family time was like gold dust.
She came to our 40th (restaurant) anniversary lunch and drank so much of the free booze at lunchtime that several friends asked me if she was an alcoholic. When we all went back to our home after the meal she proceeded to unwrap and open several bottles of champagne that we had received as gifts and drink a glass from all of them, despite the fact that there were already open bottles on the table.
She is still probably the most insensitive person I know. As she is one of my oldest friends I have not absolutely cut her off, but she doesn't know where I live any longer so cannot just call in when passing.
Interestingly her mother was an absolute cow and she always criticises her - she is now a mirror image of her in many respects.