In The Big Bang Theory episode ‘The Romance Recalibration’, while Wolowitz (Simon Helberg) and Koothrappali Kunal Nayyar try to fix a squeaky floorboard in the baby’s room, Penny (Kaley Cuoco) and Leonard (Johnny Galecki) get into a fight. Penny feels that Leonard is taking her for granted. While spending the weekend at a spa with Sheldon (Jim Parsons) and Amy (Mayim Bialik), they ask Sheldon to draw up a relationship agreement.
In a later scene, Penny comes home — rocking an awesome maroon pant suit – and she’s greeted by Leonard who has decorated the apartment with dozens of roses and lighted candles. Awww. The Big Bang Theory airs Thursdays at 8pm on CBS.