Minecraft season 1: Both The Completionist and Soah die very early on. The former mysteriously left his computer and didn't return for the rest of the playthrough, while the latter struck lava and was killed. Much later, McJones abruptly dies when the Enderdragon pushes him into the abyss seconds after entering The End.
Terraria: Midway through, Dean and McJones are suddenly and unceremoniously squashed by a boulder while mining underground.
Minecraft season 2: Dean gets killed by a Skeleton early on. Later, NintendoCapriSun is ambushed by a spider and multiple creepers. He might have made it out alive, but his controls seemed to have stopped responding.
Foreshadowing: The opening of episode #20 of "Minecraft HC #2". It has the same "Seven heroes set out to [insert goal here]; only [x] remain." intro as the last episode of the first "Minecraft Hardcore".
Freud Was Right: invoked "She shakes your bag around and it gives your wand special... powers... uhhhhhh-"
From Bad to Worse: PBG dies in the latter half of episode 19 of Minecraft Season 2. Things slowly calm down a bit. Then McJones dies too, and Barry narrowly avoids death.
Fully Automatic Clip Show: At the end of his "Hey You, Pikachu" episode, as he was unable to come up with an ending to the episode, PBG played every single time he said "Pikachu" back to back.
Gone Horribly Wrong: The plan in episode 19 of "Mincecraft HC #2" to attack the Zombie Pigmen results in two-thirds of the remaining team to die, leaving only Barrynote who lucked out thanks to a convenient crash.
Gosh Dang It to Heck!: He rarely curses, preferring not to. He even discusses this during his Darkseed Let's Play.
Heel Realization: PBG has one of these at the end of the Oblivion Collection Series. After realizing how many evil things he's done to get the Daedric Artifacts, he accepts his death at the hands of an Anvil city guard.
Heroic Sacrifice: In Minecraft Hardcore #2, Jared does this to save a lagged-out PBG.
Stupid Sacrifice: As many commenters on you tube pointed out, it could have been avoided if he had simply attacked the Creeper the moment he saw it rather than urge PBG to run away with the full knowledge that PBG was suffering from lag.
Leeroy Jenkins: Throughout the Minecraft Hardcore lets play, he behaves rather boldly, but this especially hits home when he spends time fighting in a desert that he's realized has unusually high enemy spawns. This eventually gets him killed.
Mercy Kill: PBG killed Kyrak in "Minecraft HC #2" because of his bad internet connection.note To be specific, he kept logging out because of how bad his connection was, and it got to the point that the server (for a while) refused to let him back on.
Mood Whiplash: In Episode 10 of Diablo II Hardcore, Dean dies out of nowhere.
Ragtag Bunch of Misfits: The Minecraft Hardcore characters, who include Link, Donald Duck, Zero, Haseo, Master Yi, Jim Raynor, and Shy Guy, and in the second season include Shaggy, Yoshi, Locke Cole, a Poet Pirate, Marth/Haseonote Dean changed his skin very shortly before they started playing, and it took a bit for it to change from Haseo to Marth on the others' screens., Regulus (from Bomberman 64), and Kermit the Frog.
Rule of Seven: His Hardcore playthroughs always have seven people.
Running Gag: Small one, but he keeps bringing up a "Top 10 Sexiest Girls in Gaming", which he has yet to make. This often comes up in segments where he's working on his videos while waiting for something.
Sacrificial Lion: Dean is killed very quickly by a skeleton, showing that things are going to be more serious this time. In Minecraft Hardcore 1, the only player that wasn't killed by stupidity/bad luck was Jon Tronnote And even then, it didn't really count because him and Barry had already defeated the Ender Dragon, and were just goofing around at that point.
Sanity Slippage: In MC Hardcore #2 Episode 20, Barry claims to feel Dean's presence in his sword, and rambles to a Wither Skull named Jeffrey after becoming the Sole Survivor in the previous episode
Take That: In his Top 10 list of Video Game jerks, he says jerks in video games are less realistic than people in real life, stating that people are much kinder in real life, all while the screen is filled with screenshots of various people's YouTube comments with similarly varying insults aimed at him. And Goats.
The Cameo: Provides one for Jon Tron at the end of one episode, where PBG wonders how on Earth Jon Tron managed to run all the way to Texas.
Throw It In: Unable to type "PBG" with Hubert The Teddy Bear's lousy onscreen keyboard, PBG decided that the result of his unsuccessful efforts, "EESDESESESRDT" were a good enough name for his character.