Sheldon corrects someone’s grammar or fact
Leonard adjusts his glasses
Howard tries to flirt awkwardly
Video games
A whiteboard full of equations is shown
Penny says ?Oh, sweetie?
Raj struggles to talk to women
Amy talks about her work with monkeys
superhero t-shirt
Bernadette’s high-pitched voice comment
Penny misunderstands a scientific concept
Elevator mention
FREE
Bazinga!
Dungeons & Dragons
Raj talks about Cinnamon
Howard mentions his mom
Nobel Prize is mentioned
Roommate agreement
Sheldon knocks three times before entering
Comic book store
Soft Kitty
Sheldon sits in “his spot”
Cheesecake Factory
Star Trek reference