Darvo: "I'm detecting a large security force heading your way. It's the Gri- No wait, it's the Corpus. Definitely the Corpus."
This is a Take That, Us referring to how the Lotus would always say additional forces were Grineer... when they were Corpus or Infested.
Darvo and his father arguing over family business while you are occupied tearing appart Corpus guards and fighting a Hyena pack.
Occasionally the AI of an enemy will be confused between two positions they can take cover in and the player's distance. This results in them running in circles endlessly.
Using Valkyr's Rip Line ability on a Scorpion finally giving them a taste of their own medicine.
The event where the Tenno rescue Darvo from his father, Frohd Bek. Throughout the entire mission, the two bicker about duty and freedom as the Tenno slaughter their way through Corpus troops, and Darvo keeps apologizing to the Tenno for having to listen to all this.
As intimidating Hek's interruption during the developer livestream was. His comment about throwing "Your beloved Lotus into the sun." is so narm inducing it becomes hillarious.
A good chunk of the alerts DE posts in the chat to tell players updates or hotfixes are coming (lovingly referred to as "redtext" by fans because of their red color) are filled with hilarity.
In the revamped Tutorial, when the Tenno realizes that Darvo's blueprint for the antidote for the parasite that is slowly turning the Tenno into Vor's puppet requires components that Darvo "conveniently" forgot to give them, Ordis has some... choice words for him. We don't actually hear the rant, but Darvo's response says it all.
Darvo: My mother may not be a gymnast, but she would never eat stuff like that!
Ordis's reaction to finding out the Tenno plans to raise a Kubrow on the ship.
Ordis: To think it's been years since a Kubrow SPREAD FILTH ALL— graced this ship! Operator, drop the egg into the system to begin breeding— DROP IT ON THE FLOOR.
Ordis has many moments when his voice switches abrubtly that can range from funny to slightly disturbing.
In the Cryotic Front, the Tenno have been extracting reams of the crucial cryotic resource for their mysterious employer, all the while fighting huge legions of enemies to acquire it. What makes the cryotic so incredibly valuable? The employer needs it to preserve a species of Martian jellyfish that is a delicacy but spoils easily during transport.
Getting an explosive kill with the Galatine. If the right animation plays, expect to be saying "IT'S A HOME RUN!" to yourself as you see mangled body parts flying off into the distance.
Just about every kill with the various bow type weapons count, especially when the arrow or bolt goes through several enemies at once and pins them all to the wall. It's difficult to pull off, it's incredibly awesome when it happens, and it's funny as hell to boot.
The Mutalist Quanta is a Corpus Line Gun-looking weapon that's been covered in the Infestation. While the regular Quanta has a standard 'pull clip out, put clip in' reload animation, when you reload the Mutalist Quanta, a little tentacle pops out of the Infested mass and pulls out the empty clip while the Tenno slots a new one in at the same time. Awww.
Darvo's various offers for weapons combines his skills as a salesman with his flippant anger and annoyance at his fellow Corpus.
Darvo:So Tenno, word has it you’ve been working with a certain Baro’ Ki Teer? What? The name doesn't ring a bell? He had you searching all over for Cryotic. I guess maybe he wouldn’t tell you his name — he does that. He thinks it makes him seem mysterious — it doesn't. Plenty of people know his name. Either way, I hope he lived up to his end of the bargain. Not everyone is as trustworthy as your friend Darvo. Wait, did someone say bargain? I did! Here we go. For one day only, the Atterax is half price. Use this bladed motorized whip to give the Grineer a taste of their own medicine. Or, if you’re like me, you might find it handy for snaking out the plumbing in your ship. It’s up to you.
Darvo: Tenno, I guess I was curious, I paid Baro Ki’ Teer a crate full of Prime Blueprints and two Argon Crystals just so I could sample his so called “delicacy”. Those Oasis Jelly fish caused my throat to swell up for three days. Damn near killed me. What a rip-off. But you know what’s not a rip-off? My new bundle. Here’s what you get: the Hydroid Warframe, Nami Skyla Blades, Triton Helmet, Para Carrier Sentinel and all its fancy parts. Hell, I’ll even throw in Credit and Affinity boosters, just because.
Darvo: Oh and let me guess, Baro Ki’ Teer wouldn’t even show you his face, figures. He thinks he’s too good for you and me with his swanky clothes and exotic foods that taste like mud. Well you know what Tenno, when you buy from him that’s what you’re paying for. When you buy from Darvo, you get nothing but deals. Allow me to provide a simple illustration. Today only, at 50% off I’m offering you the Amprex Electricity Rifle. 10,000 volts of shut your elitist face. I never wanted to go to his stupid party anyway.