[s3e11] The Maternal Congruence Info

: Sheldon objects to traditional Christmas decorations, instead hanging a bust of Sir Isaac Newton on the tree because Newton was born on December 25th, unlike the historical figure typically associated with the holiday.

: This episode is notable for being the first of only two in the series where a main character— Raj Koothrappali —appears but has no speaking lines . [S3E11] The Maternal Congruence

: After feeling neglected by Leonard, Penny takes Beverly out for drinks. The legendarily uptight neuroscientist eventually loosens up over tequila shots, leading to a hilarious bonding session where she begins to treat Penny as her "home girl" . "Sheldon Alpha 5

: Sheldon jokes about leaving the Enterprise in a shuttlecraft to a planet he rules, "Sheldon Alpha 5," a nod to the planet Ceti Alpha 5 from Star Trek II: The Wrath of Khan . Critical Reception Penny takes Beverly out for drinks.