Drinking binge

A man and his wife are dining at a table in a plush restaurant, and the husband keeps staring at a drunken lady swigging her gin as she sits alone at a nearby table.
The wife asks, "Do you know her?"
"Yes," sighs the husband. "She's my ex-wife. She took to drinking right after we divorced seven years ago, and I hear she hasn't been sober since."
"My goodness!" says the wife. "Who would think a person could go on celebrating that long?"