re: game contestants get pumped with oxygen, arm wrestle, and try not to fart

The show the guys are doing that for is pretty funny actually. I randomly stumbled across their show with a friend one time just going through youtube videos.

The guys watching and laughing in a separate room host a variety show called Gaki No Tsukai that has been on for like 30 years.

Each year they do a New Years Eve Special where they spend 24 hours together in some themed environment. They are not allowed to laugh or they get punished (in a variety of ways most are painful). If you can find the subtitled ones they are absolutely hilarious and I believe its one of the most popular shows in Japan.

Here's a link to one where one guy lost a bet and was forced to get pies thrown at him all day while going through his "daily routine"

Pie Hell