Running Gags

Phrases and stunts that repeatededly come up in the episodes.

Stunts:
 * Shot of a front door while a character abruptly exits with someone screaming "Get out!"
 * Walking up the stairs.
 * Howard's mother always yelling from off-screen.
 * Penny getting promiscuous and morally loose when she drinks.
 * Penny's anger.
 * Bernadette's voice changing when she gets angry.
 * Penny's "check engine" light.
 * Raj and Howard seem as though they are a homosexual couple, but aren't.
 * Raj gets drunk due to his inability to talk to women (until the The Bon Voyage Reaction).
 * Sheldon taunting Leonard with the "Roommate agreement".
 * Sheldon mocks Howard's master's degree.
 * Sheldon's couch spot.
 * Sheldon's knock, knocking 3 times, saying the name of the person addressed, and repeating it twice after.
 * Sheldon getting restraining orders from Star Trek actors/scientists.
 * Sheldon blaming Leonard for first speaking to Penny in the pilot episode.
 * Singing "Soft Kitty" to comfort Sheldon or other sick people.
 * Sheldon blaming others for things that he has done.
 * Someone asks Shleon "Why?" and others get upset since Sheldon has been given an opening to deliver a long explanation.
 * Monkey references and comparisons.
 * Leonard and Penny acting like Sheldon's parents.
 * Penny's mispelled Chinese character tattoo.

Phrases:
 * Bazinga. - Sheldon
 * You're in my spot. - Sheldon
 * In what universe... - Multiple users
 * My mother had me tested. - Sheldon
 * Oh (my) God! - Penny
 * ...on purpose. - Multiple users
 * Here we go... - Multiple users (usually followed by one of Sheldon's "psychotic rants")
 * ..offer them a hot beverage. - Sheldon
 * Once again, you’ve fallen for one of my classic pranks. Bazinga ! - Sheldon
 * This may be the wine (magic potion) talking... - Multiple users
 * That's the spirit - Leonard
 * What the frak? - Howard
 * ...jibber jabber... - Multiple users
 * Holy crap on a cracker - Penny
 * Your check engine light is on - Sheldon
 * There, there - Multiple users
 * Sweetie... - Penny
 * Oh not this again. - Sheldon
 * Oh, balls! - Penny