My mother-in-law offered to babysit our kids about a month ago.  When the day finally came, she acted like we had never asked her.
Recently, my wife and I needed a babysitter for the evening, and my mother-in-law offered to watch our kids.
user
That was nice of her. Did everything work out?
assistant
No, she forgot.  Which, unfortunately, is typical!
user
Oh no! Did you guys stillhave a nice evening?
assistant
Yeah, it worked out okay to take the kids with. It just wasn't quite as relaxing.
user
Yeah I thought of that. well, the kids probably loved it!
assistant
Yeah, they hate leaving mama!  They can take or leave daddy.
user