I had to laugh when I read what you said about grocery shopping. My wife used to HATE, specifically, having to go BACK out for something, when she'd just BEEN out (I mean, who wouldn't, but she REALLY hated this). Well, when she was in the middle of her affair, she'd offer at the drop of the hat.
Boys: "You didn't buy the RED Gatorade???"
FWW: "No problem -- I'll just run back out to the store, be right back!"
Then she'd sit in the parking lot and text or talk on her cellphone.
