During some pillow talk with Chelsea, Charlie accidentally let's it slip that he loves her.  Unfortunately, Charlie ends up getting a thank you back, rather than an I love you.  After going to therapy for it, Charlie decides he needs to restore the balance of power and get her to say I Love You back.  Charlie gets so desperate to hear it back, he proposes to Chelsea at dinner by sneaking a ring into her glass of champagne.  However, Chelsea ends up drinking and swallowing the ring.  After giving her a couple cups of coffee the next days, Chelsea poops out the ring and ends up screaming, "Oh Charlie, it's beautiful!"