yep, i relate to that as well. Not so much my wife but more her parents - i once - in a rare good mood - offered to buy the entire family lunch the following day. Everyone agreed on Shabu. We all arranged to meet at 1pm the next day.
At 1.15 , i got the wife to call and see where they were. ........
"Still at home - Mother is just going to get a shower."
My resulting moody put the mockers on that day.
Im not so bad about punctuality now. I cannot bear to be late myself but ive learned not to expect anyone else to be the same.