Contest of "Kamehame-ha" in NZ

In the following movie, you'll see a lot of "Kamehame-ha" figures, which are originally appeared in Japanese manga "Dragon ball." This contest was held in New Zealand, according to an explanation of the movie. All of the participants are very, very excited, and we don't hear the whole word. I've not heard of the contest like this in Japan.



My favorite "Kamehame-ha" is the 1st child's one, because his face is very serious for its contest. I'm interested in the gap between his face and concept of the contest.
Which do you like the best? ;)

Ref: "Kamehame-ha" in actual "Dragon ball" is as follows (in English):



We, Japanese, often watched this animation by TV, and all of the characters spoke in Japanese. So, the animation in English looked out of place for me.

Just in case, here is perhaps original "Kamehame-ha," by "Kame-sennin."