The girls join in on a game of Dungeons and Dragons for the very first time on The Big Bang Theory. "The Love Spell Potential" is the 23rd episode of the show's sixth season.
Penny: Vegas here we come. Bernadette: No husbands. No boyfriends. No rules Amy: No rules. We're not going to get drunk and have a six-way with the Blue Man Group, are we? Penny: No. Amy: So there are some rules. Bernadette: Okay. No husbands. No boyfriends. Some rules. Amy: Thank you. VEGAS!