* In ''Unforeseen Consequences'', the microwave that you used to blow up the casserole has a headcrab in it, and you can turn the microwave on and make it explode like in ''Film/{{Gremlins}}''!
* Also in ''Unforeseen Consequences'', Dr. Kleiner will exclaim "By Schrodinger's cat! You're alive!"
* [[http://memebase.cheezburger.com/puns/tag/half-life "You better make like a banana and split" puns]]
* At one point in ''Office Complex'', one can find (likely through hearing it first) a Houndeye sitting in a room and making curious noises while watching a TV filled with white noise.
* The expanded lines for the {{Non Player Character}}s can lead to some downright hilarious snarks and random comments - sometimes [[WelcomeToCorneria randomly having nothing to do with the context of the situation.]]
** Every variation of the guard's "Make like a banana and split" line, including "You better make like diarrhea and run."
** "Ya know, they used to give me pills for that kinda behavior."
--> '''Guard:''' Man, cease and desist, or some shit!
* Gordon. Pets. A. Snark.
** [[http://wiki.blackmesasource.com/File:Playsnark.gif Neeeeigh]].
* Kleiner instantly falling in love with the first Headcrab he sees... [[VideoGame/HalfLife2 which we may assume will be called Lamarr some time later]].
* If they manage to stay alive long enough, the guards have some stern words for the HECU.
--> '''Guard:''' (noticing a marine miss him) Semper Fi, ya douchebags! (cue returning fire)
--> '''Guard:''' Go back to rifle class, Gomer!
--> '''Guard:''' Better stick to peeling potatoes, Skippy!
* [[DepartmentOfRedundancyDepartment Thank you for noticing this new notice. Your noticing it has been noted.]] [[OhCrap And will be reported to the authorities.]]
* Black Mesa answers the question of just how the hell one wields the [[LivingWeapon Hivehand]], and the result of equipping it. [[http://www.youtube.com/watch?v=Ka-QAUwVCdw You can't help but feel sorry for the poor thing.]]
** For bonus points, wait to do this until you find the nearby security guard. [[http://www.youtube.com/watch?v=_fyvBNXi_64 He'll have some hilarious reactions]].
--->"You want a cigarette? Not you, the hand."
* Keep your subtitles on for some gems, particularly early on. Among them, the subtitles actually extend the r in "They're waiting for you, Gordon. In the test chamberrrr." During the same line, [[LampshadeHanging one of the other scientists turns around to look confusedly at the one who says it]].
* If you return to the locker room after the Resonance Cascade, you'll find one of the lockers has been blown open. Inside is a sign reading "[[BrickJoke No Ridiculous Ties]]".
* In Anomalous Materials, one of the scientists is criticizing a research paper written by one of his colleagues. Talk to him long enough and he spouts this gem:
-->"And what in blue blazes is a... is a ''[=ROFLcopter=]''?"
* The new models and textures are pretty funny, too...
** The microwave in Anomalous Materials has a setting for Headcrab.
** The Cremating Furnaces in Questionable Ethics have options for Medium, Rare, and Well Done.
** There's a sign by the laser is Questionable Ethics that reads 'Existential Danger', next to the Infinity Symbol.
*** Which becomes even funnier if you're familiar with the concept of an [[http://en.wikipedia.org/wiki/Risks_to_civilization,_humans,_and_planet_Earth existential risk]].
* When going through the portals, you can find a room with a male scientist, female scientist, and a guard.
-->'''Guard:''' You two argue {{like an old married couple}}.\\
'''Male scientist:''' We ''are'' an old married couple!\\
'''Female scientist:''' Who are you calling old!?
* Inspection of the games soundscape scripts reveals the following comments at the top of the scripts:
-->//Inbound: Welcome to Black Mesa! Where hazardous chemical spills are a daily occurance!
-->//Anomalous Materials: Someone explain to me why Gordon's job inside the test chamber, couldn't have been done by a robot, or even a monkey...
-->//Unforeseen Consequences: This is what happens when you 'force' a computer to divide by zero.
-->//Office Complex: Unbeknownst to the staff, the cafeteria had been serving bullsquid for years.
-->//We've Got Hostiles: Hey guys, thanks for the rescue. Oh, what? A bullet with my name on it? Cool!!
-->//Blast Pit: There's an alien tentacle in my soup.
-->//Power Up: The tunnel system smelled like fried chicken for months afterward.
-->//On A Rail: Good thing Gordon was around, or the scientists would have been forced to unleash droves of monkeys to press the rocket launch button.
-->//Apprehension: Luckily, the Female Assassins were in short supply. If Gordon had to face more than 3-4 at once, he never would have made it to Xen.
-->//Residue Processing: Tryouts for the Black Mesa swim team every Tuesday and Thursday.
-->//Questionable Ethics: Please remain stationary, while we remove your internal organs.
-->//Surface Tension: Look carefully for the hang gliding mini game in the cliffside level!
-->//Forget About Freeman: The 2008 finincial ''[sic]'' crisis was simply a cover for the repair costs of the Black Mesa facility.
-->//Lambda Core: And in the end, it was all just a crazy, radiation induced, nightmare!
** You get the feeling that someone in development had a thing for Machinima/FreemansMind given that fried chicken joke was in that series.
* Not the game proper, but the voice actor for Kleiner posted [[http://youtu.be/gyYIjn0V1Uc this video]] of him singing Sir Mixalot's "Baby Got Back" in the Kleiner voice.
* [[https://www.youtube.com/watch?v=y6gJWv8GjZU The bloopers]]. HilariousOuttakes at their finest. Special mention goes to the alternate Black Mesa Transit System safety spiel and the security guard's [[PrecisionFStrike bewildered reaction]].
--> '''Black Mesa Transit System:''' Please keep your limbs inside the train at all times. Fasten your seatbelts, [[NonSequitur and do not feed the rabid monkey]].
--> '''Guard:''' What?
--> '''Black Mesa Transit System:''' Do not attempt to open the doors until the train has come to a complete halt at the station platform.
--> '''Guard:''' [[ItsProbablyNothing Must've been my imagination...]]
--> '''Black Mesa Transit System:''' Failure to comply may result in limb loss...
--> '''Guard:''' Huh?
--> '''Black Mesa Transit System:''' ...termination of your pass for the transit system...
--> '''Guard:''' Ugh...
--> '''Black Mesa Transit System:'''[[ArsonMurderAndJaywalking ...and a one-way ticket to the principal's office.]]
--> '''Guard:''' [[LampshadeHanging Principal's office? What?]]
--> '''Black Mesa Transit System:''' In the event of an emergency, ignore it, and it will pass.
--> '''Guard:''' [[PrecisionFStrike What the FUCK?]]
--> '''Black Mesa Transit System:''' Passengers are to remain seated and await further instructions should the emergency continue.
--> '''Guard:''' *clears throat* Ugh...
--> '''Black Mesa Transit System:''' If it is necessary to exit the train, each man for himself...
--> '''Guard:''' What the f...?!
--> '''Black Mesa Transit System:''' ...and the disabled personnel may wait behind and pray for a miracle.
--> '''Guard:''' SON OF A BITCH!
* The HECU grunts have some funny quips if Gordon manages to wound them.
--> '''Grunt:''' I'M SO GLAD THE MEDIC DECIDED TO TAKE A FUCKING VACATION!
* If you enter the server room during Anomalous Materials, a security guard points out that you ''did'' show up for work today, and reminds a scientist nearby that [[SideBet that means he owes him a pizza]]. If you then talk to the scientist in question, he makes [[SoreLoser several dirty remarks at the guard]].