One of the best Youtube series there are out there. It is made by DasBoShitte.
Dr. Hax: The profound and crazy doctor of the show who destroys all hackers of any kind.
Chuckles: He is the one, at the beginning of the show, to cheat the most, thus becoming Dr. Hax's #1 target. He later strays away from his cheatful ways.
G man: The lawyer guy that everybody should know about.
Lois: A main character in Left4Dead, he is highly obsessed with pills and will do anything for them
Francis: Another Left4Dead character. He hates Lois and is very obnoxious. He is part of the show "Everybody Loves Francis".
There are more that are unnamed or from Left4Dead too!
This series is VERY worth seeing!
A quote from the Gmod Idiot Box:
G Man: I want Breakfast.
Man behind counter: Well...I'm really sorry
G Man:......Well, I'm really sorry *pulling out gun* t-
Random Man: HE'S GOTTA GUN!
Everybody at Bar: AHHHHHHHHHHHHHHHHHHHHHHHHHHHH!
G Man: HEY, hey, it's okay, alright, just, just sit down, now ya gotta have your vegetables, vitamins and whatno-
*Gun starts shooting randomly everywhere*
G Man: IT'S AN ACCIDENT, It's an accident, the trigger, it's sensitive, it's sen...si....tive.....*looks at everybody dead*
G Man: Ummmm, can I have my breakfast now?
Headless man behind counter: *flicks him off*