The return of Mia (Emmanuelle Vaugier) finds Charlie questioning his devotion to Chelsea; the guys rush a laboring Judith to the hospital; Alan reunites with Melissa (Kelly Stables), who now works as a hospital clerk, and struggles in his attempt to write a screenplay; Judith gives birth to Jake's baby sister, but the parentage is still unknown; Herb breaks his leg; Charlie runs into Mia in the coffee shop, resulting in a cliff-hanger season finale. Title quotation from: Charlie, to Chelsea, while watching baseball in bed.