It does grind my gears when people don't turn up without letting me know.
But the opposite is also true I don't like people turning up unless they let me know.
edit - reminds me of one of my friends who I told reputedly I was away the next week. He drove here called me to ask why I wasn't here as eh wanted to visit.
I told him he was more than welcome to join me in Ireland if he wished to
