"What's the deal with this place? Who let the bugs in?"
(Seinfield)

"Oh boy, here I go killing again!"
(Rick and Morty)

"Hehe, I'm in danger."
(Family Guy)

"LET ME IN! LET ME IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIN!"
(Eric Andre meme)

"Alright then, keep your secrets."
(Lord of the Rings: Fellowship of the Ring)

"Wow, a gun! I wonder if it's loaded."
(The IT Crowd)

"They're gonna have to bury what's left of you in a soup can!"
(Team Fortress 2)

"Oh no! Anyway..."
(Top Gear)

"Open for business."
(Blood, 1997)

"You're too slow!"
(Sonic)

"You made me bleed my own blood!"
(Simpsons)

"Wilson? Wilson! WILSOOOOOOOON!"
(Metal Gear Solid)

"Rip and tear, bit**es!"
(DOOM tagline)

"Say hello to my little friend!"
(Scarface)

"Ugh, I feel like a TV dinner."
(Die-Hard)

"You are a loose cannon, but you are a damn good cop!"
(Old Team Fortress 2 meme)

"Why do we all have to wear these ridiculous masks?"
(Half-Life)

"Pick up that can."
(Half-Life 2)

"Hot hot hot, hooot hot hot hot hot!"
(South Park)

"Now I'M bringing the irony to the firefight!"
(Half-Life 2)

"That is quite possibly the most horrifying thing I have ever seen in my entire life."
(Left 4 Dead 2)

"It's rabbit season."
(Loony Toons)

"Argh! Tis but a scratch!"
(Monty Python and the Holy Grail)

"I'm gettin' too old for this sh*t."
(Lethal Weapon 2)

"You're not doing anything. You're just acting busy. That's your whole job, isn't it? Acting busy."
(Freeman's Mind)

"Ah, sh*t, guess I'm not the 'drift king.'"
(RTgames)

[Wilson] "Aaand, open!"
(Borderlands)

"Hell's horses!"
(The IT Crowd)

"War never changes, I guess."
(Fallout)

"Welcome to Earth!"
(Independence Day)

"Agh, my leg!"
(SpongeBob)

"You don't talk too much."
(Half-Life 2)

"Conquered the earth in seven hours but.."
(Half-Life lore)

"It looks like we won't be working together."
(Gman)

"Fine, keep your secrets."
(Lord of the Rings)

"Nobody rides for free."
(Left 4 Dead 2)

On a Road
(Reference to Half-Life map On a Rail)

Still Alive
(Portal's credit song)

Dirty Harry
(Dirty Harry movie)

Worth the Weight
(Gabe Newell's statement 'hopefully it was worth the wait' often mistaken as 'hopefully is was worth the weight)

Overwatch Says Stop Kicking it
(Funny moment from Half-Life: Alyx)

Now There are Two of Them
(Star Wars prequels meme)

Science Team
(Half-Life)

Lake Tuurngait
(Penumbra: Black Plague)