The inflatable ball water walker thing looks great, but if you went over a rock and punctured it, you'd probably die because water would fill it and it would still be around you...
The super powerful laser reminds me of the story of the teenage boy with a super powerful laser putting on a "light show" for his little sister in the bathroom. The laser hits the mirror and reflects in his eyes, making him forever blind in one eye and permenetly scarred and half-blind in the other.
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