Mad Men: When Being 30 Is A Single Woman's Darkest Secret

On last night's Mad Men » 8/04/08 5:00pm 8/04/08 5:00pm, we finally saw some of the cracks Joan Holloway's ice-y demeanor when Paul Kinsey — an exec at Sterling Cooper and one of Joan's exes — retaliated against her (on point) bitchiness by photocopying her license and hanging it in the break room so everyone could see her real age. Joan, who…