This counts as this and also Crowning Moment of Heartwarming but during his livestream of SCP 087-B, he decided to go down to at least floor 50 before ending when requested by a substantial donor, which he not only does during his next attempt but also manages to reach the end.
How about the very beginning and end of this? first he managed to kill the traitor at the very second that the match starts and then at the end, he kills himself to frame one of the players who actually turned out to be the traitor!
His second Nether video has Mark stumble upon two seemingly friendly players and he helps them kill some monsters. Shortly afterwards he is betrayed and attacked by one of the other players and has to flee. Immediately after loudly lamenting his lack of a gun, he stumbles across an assault rifle with a full magazine and returns to hunt down his attackers. Made all the funnier by the original attacker rushing Mark only to realize he is now significantly outmatched, and his friend trying to make a speedy exit before being gunned down.
*Taking shelter in a nearby building* "Oh, if I find a gun in this house, you're going to get it! Right up the ass!" *Immediately finds gun* Ohohaha! "Did they ever make a mistake to mess with me!"