An in-joke, also known as an inside joke or in joke, is a joke whose humor is clear only to people who are in a particular social group, occupation, or other community of common understanding; an esoteric joke. It is humorous only to those who know the situation behind it. （Source: Wikipedia）
Bacteria: Back door to cafeteria Barium: What doctors do when patients die
Catscan: Searching for kitty Cauterize: Made eye contact with her Coma: A punctuation mark.
D&C: Where Washington is
Enema: Not a friend ER: The things on your head that you hear with
Fester: Quicker than someone else
Genes: Blue denim slacks G.I. Series: World Series of military baseball
Hemorrhoid: A male from outer space
Impotent: Distinguished, well-known
Medical Staff: A doctor's cane Morbid: A higher offer than I bid
Nitrates: Cheaper than day rates
Organ Transplant: What you do to your piano when you move Outpatient: A person who has fainted
Pap Smear: Making fun of Dad Pathalogical: A reasonable way to go Pharmacist: Person who makes a living dealing in agriculture Pelvis: Second cousin to Elvis Post Operative: A letter carrier
Recovery Room: Place to do upholstery Rectum: Almost killed him Red Blood Count: Dracula
Secretion: Hiding something Seizure: Roman Emperor
Terminal Illness: Getting sick at the airport. Thorax: A Dr. Seuss character Triple Bypass: Better than a quarterback sneak Tumor: More than one, an extra pair
An in-joke, also known as an inside joke or in joke, is a joke whose humor is clear only to people who are in a particular social group, occupation, or other community of common understanding; an esoteric joke. It is humorous only to those who know the situation behind it. （Source: Wikipedia）
In-joke，也叫inside joke或in joke，是只有在同一个社交圈子、职业或者思维理解方式一致的群体内才明白的幽默，即“圈内人的幽默”。只有那些了解事件背景的人才能明白其中的幽默之处。
Why was the new head IT official of IBM hospitalized? Because he didn't know and accidentally touched the firewall.
I got paged at 3AM to the SICU. I called them, a bit curious as to what was going on, as 3AM calls to the neurologist rarely come from the SICU.
When I introduced myself as the on-call neurologist, the very southern-sounding nurse loudly exclaimed:
"Neurology? I wanted Urology. I got the wrong end!"
Artery: The study of fine paintings
Bacteria: Back door to cafeteria
Barium: What doctors do when patients die
Catscan: Searching for kitty
Cauterize: Made eye contact with her
Coma: A punctuation mark.
D&C: Where Washington is
Enema: Not a friend
ER: The things on your head that you hear with
Fester: Quicker than someone else
Genes: Blue denim slacks
G.I. Series: World Series of military baseball
Hemorrhoid: A male from outer space
Impotent: Distinguished, well-known
Medical Staff: A doctor's cane
Morbid: A higher offer than I bid
Nitrates: Cheaper than day rates
Organ Transplant: What you do to your piano when you move
Outpatient: A person who has fainted
Pap Smear: Making fun of Dad
Pathalogical: A reasonable way to go
Pharmacist: Person who makes a living dealing in agriculture
Pelvis: Second cousin to Elvis
Post Operative: A letter carrier
Recovery Room: Place to do upholstery
Rectum: Almost killed him
Red Blood Count: Dracula
Secretion: Hiding something
Seizure: Roman Emperor
Terminal Illness: Getting sick at the airport.
Thorax: A Dr. Seuss character
Triple Bypass: Better than a quarterback sneak
Tumor: More than one, an extra pair
Varicose: Near by/close by
Vein : Conceited
head up in the clouds 更多是说脱离现实
一头雾水 是 confused or lost, similar saying is "it's all greek to me"
Chem is try！
英文化学Chemistry在很多情况下简称为Chem，如Chem 9578(一门化学课程）。
Chem is try意即化学是一门试验科学