Did You Just Punch Out Cthulhu?: What was Robbaz's first reaction to seeing Slenderman? Pull out a pistol and shoot his nipples off. When that failed? Charge the SOB head on. Obviously this failed, but Robbaz claimed victory by merit of raping Slenderman.
Done literally in a Skyrim playthrough, where his character is such an unarmed juggernaut he can punch dragons to death.
Drives Like Crazy: If Robbaz ever gets behind the wheel, run. Run far away. And pray he doesn't come your way. Within seconds of picking a different car in a driving simulator, for example, he goes as fast as possible and ends up in a ditch within seconds.
During his time in a Hind D in Take On Helicopters, Robbaz tries to lift off, but only spins around in circles. When he tries to fix this, he ends up accidentally turning off the engines. When he looks up from the console, he finds that not only is it still spinning, he's sideways, falling like a brick and spinning faster.
Foreshadowing: While playing Skyrim's "Mind of Madness", Robbaz makes an offhand comment that "[he] would never kill Walrus" Technically He didn't, but he did believe Walrus was dead when he was turned into a sweetroll
Funny Background Event: Several normally-serious Skyrim moments are ruined by Walrus' antics in the background. He has a habit of climbing up on things he's not supposed to.
During a bugged out Silent Hunter cutscene in which a submarine captain talks to a nonexistent superior, the U-boat that Robbaz carefully piloted into the dock to trigger the cutscene slowly enters the frame before crashing into the wall of the submarine pen. The best part of it is that the Atlantean deck gunners are still manning their positions, come hell or high water.
Hoist by His Own Petard: Having rushed his way to the Dragonrider boss in Dark Souls 2, when it kills itself without even requiring a single hit he takes the time to put the controller down and mock the boss... only for one of the enemies he ran past earlier to come up behind and kill him.
Mood Whiplash: Robbaz has a tendency to utterly demolish any sense of drama that the game he's currently playing might have otherwise had. One good example is Astrid's death in his Skyrim play through. Absolutely horrifying in the original game, but Crosses the Line Twice with Robbaz reanimating the burnt corpse over and over while giggling like a little kid.
During his Redneck Brothers playthrough of Sims 3, having spent the entire episode physically experimenting on his Sims, he seems legitimately sad when his butler Bertram is killed by a freak dishwasher accident, spending several minutes building a very nice looking grave and delivering a proper eulogy. This is immediately followed by the Sims literally dancing on top of it.
My God, What Have I Done?: Robbaz has a flash of this at the end of his "Mind of Madness" playthrough when he accidentally blasts Walrus with the Wabbajack and turns him into a sweetroll.
Its a frequent response to the deaths of any of his Kerbals whenever he messes up in Kerbal Space Program. Its quickly glossed over, though.
Names to Run Away From Really Fast: Robbaz is certainly an intimidating name, but then you've got Pro-Wrestlers named "King of Nipples" and spaceships dubbed "Nipple Sky Penetrator". If you ever end up in Robbaz's world, it's best to just never stop running.
His weapon of choice for most of Dark Souls 2 was dubbed the Club of Happiness.
Oh, Crap / This Is Gonna Suck: In his Crashtastic #3 video, he sees a level which causes him to simply let out a foreboding "Ohohoho! Oh no. Ohh noo..."
Rage Quit: After spending the entirety of Dawnguard stumbling around in caves only to be told that he's got to go through more caves for the Chantry part of the quest, Robbaz gives up and tries to find where they've hidden the Dragonborn DLC.
Suddenly Shouting: Also from his Crashtastic #3 video, when he experienced success in a level in a somewhat unorthodox manner, he promptly yelled "DAAAAOOOOOWWW VIKING POWAH!! DAAAGH!". He quickly apologised.
His Dark Souls 2 streams frequently discuss how much of a psychopath his neighbors must think he is, constantly shouting about Valhalla.