The Big Bang Theory Season 7 Episode 9
The Thanksgiving Decoupling
Bernadette's father is coming to town for Thanksgiving at Mrs. Wolowitz's house and Howard invites his friends to come too. Sheldon doesn't want to break the tradition of Leonard's bad cooking, but gives in after everyone else is going. Mrs. Wolowitz gets sick, so Raj ends up doing the cooking with Amy and Bernadette's help.
Penny finds out that what she thought was a fake marriage to Zack was in fact real. Leonard is upset about it and wants her to get it annulled as soon as possible. Penny invites Zack to Thanksgiving to sign the papers which also upsets Leonard. In the end, Zack signs the papers and has a nice Thanksgiving with his "wife."
Sheldon and Bernadette's dad bond over football which makes Howard even more uncomfortable around his father in law. Sheldon gets drunk and throws up. And, Bernadette's dad says that Howard's not all that bad.