Do Not Laugh Batsu is a kind of gameshow where they have to endure comedic torture for 24 hours without laughing - if they do laugh, they are severely punished (so called 'batsu').

These are my favorite scenes from the episode when they have to dress up as nurses and work at a hospital. After the first scene, Do not laugh batsu turns into Do not show fear when they have to go to the hospital at night to retrieve forgotten items.

I feel soooooo bad for poor Tanaka in this one.. They all look cute in little nurses outfits :)

Do Not Laugh Batsu is from Downtown no Gaki no Tsukai ya Arahende!! - a Japanese variety show. I do not own this! (less info)