http://en.wikipedia.org/wiki/Gaki_no_tsukaisome of these descriptions sound brilliantly hilarious
No Laughing in High School
The English-lesson segment of this batsu game is perhaps the single best known Gaki no Tsukai segment outside of Japan.
During this segment, the cast sits in a classroom watching an educational video. What they get is Jimmy Oonishi reading an English article about Marco Polo, counting from 1 to 100 in English, and saying all the days of the week in English. He was utterly bewildered by the English language and makes a number of ridiculous mistakes. His mispronunciations in this segment include "asked", "questions" (which he pronounced into lotion), "Venice" (which he pronounced as Victor). When he counted from 1 to 100, he assumed 20 was called "ten-ten", 21 being "ten-ten-one" and so on. He ended the count by calling 100 "ten-ten-ten-ten-ten-ten-ten-ten-ten-ten"
Silent Library-
http://www.youtube.com/watch?v=CRMOeMgYESo&feature=related
Chinko Machine
In a segment from the episode "Ōgiri Daigassen", the participants must recite a long, tongue twister-like promotion for the show without stopping or stuttering. If a participant fails, they are attacked by the “chinko machine”, literally the “penis machine”, a catapult-like lever that swings up and hits the participant in the groin. This batsu game was featured on the August 1, 2006 Oddball segment of Countdown with Keith Olbermann as "Reason Number 261 (of 527) why Japanese television is better than ours."
Cosplay Bus Tour series
The bus series usually includes the main cast plus some of the producers or guests cosplaying or dressing up in female costumes and playing mini games in a bus going around popular Tokyo locations. When one loses in a mini game he is dropped off in the popular location, alone and looking quite absurd. Past cosplays include anime characters, high school girls, SM queens, and Pink Lady (famous Japanese idols) costumes. During Anime Bus Tour, Yamasaki, who dressed as Arale from Dr. Slump, was dropped off and didn't fulfilled his task to buy a spaghetti. He was then penalized by forcing him to fly to Italy in his cosplay dress, buy the spaghetti there, and bring it back to Japan.