When viewed not as serious designs, but as an art, these are kinda awesome 
There’s a lot of attention to little details, that really highlights absurdity of whole idea in big picture.
World would definitely be more boring without weird inventions in search of a problem.
Edit: To be clear, I’m talking about the non-military ones. On their YouTube channel there are also military ‘inventions’, like this autonomous mine, that is advertised for both battlefield and what looks like terrorist scenarios (WTF?):
