^Last year's biggest boom among youngsters. Origin is from Kojima Yoshio. Let's see how his "Jamaican" joke will do this year.

The joke usually starts with him talking casually about something, and then messes up by mixing up things. His failure is then followed by a "Ah~, that didn't come out right!", and that's where the joke builds up. Tough to explain since he improvises a lot at that stage. Anyway, "Sonna no Kankei nee" is roughly translated to "But that doesn't have anything to do with it!" followed by the hand thing. Also, he always ends the joke with an "Oppappi~".
About Risa's version, she starts out simply by greeting Kame, Koharu and Tsunku. As Tsunku is a senior, she has to include the -san, but in this case she "messes up". You got the part after that right, 新垣 is also read as Aragaki.
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*1.2% 12:20~12:49 テレビ東京「ハロモニ@」
瞬間最高視聴率=2.2%(12:39)
瞬間2位視聴率=2.0%(12:38)
瞬間3位視聴率=1.7%(12:40)