What is that martial art used by those dummies? It looks a bit like taekwon-do (that kick jump), am I right?

Hop-Kick-D'oh.
Their legs are on backwords or something.

Looks very much like the "Crane technique" in Karate Kid!

Hop-Kick-D'oh... heh, good one. :-D Maybe Punch-Kick-D'oh... :-D

Wait a minute here... You wonder what martial arts the dummies use but you don't even think about what kind of drugs the producers must have been on to make walking/attacking sticks that are made of hay, wood, and what appears to be a paper shopping bag with a spray painted target on it.

Not to mention those Killer Kubes and the sound they make. Goofy but fun.

How to meet all those Kubes? Are they anywhere in the game?

And about that drug - it could be Gamma Gulp from Fallout... :-D

Kubes are exclusive to the retro dungeons.

Thanks for the info.