Don't Tell Penny

When Penny tells her best friend Lou sheâ??s sure tonight is the night that her fiancé Mark will finally propose, Lou couldn't be more pleased for her. But during the course of a wild night out on the town, Lou can't help but wonder if marriage is really the thing on Markâ??s mind--and Penny hasn't noticed a thing! Could it fall on Lou to break the news gently, or will Mark bend his knee before it's just too late?