Gaki no Tsukai!!!!

Apparently, this is a Japanese game show called Gaki no Tsukai or タイトルコール噛んだらダメよ　ガキの使い for short.
I have no idea what they're saying, although I wish I did. Even so, I would sit and watch this all day. What is it about shots to the nuts that I find so funny?

After a little research, it turns out that they have to say tongue twisters correctly, or they get it in the neither region.

Genius idea if I do say so myself.