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Tim writes –

Here’s a collection of projects that didn’t work, mistakes, and accidents. I’ll be adding to this collection as time goes on.
That’s for sure. Unfortunately.

For starters, here are the impossible rollerskates. Also known as caster skates. Ian Alex demonstrates how to use them. Stand up, Move legs, fall down. To make your pair, just screw some casters to boards and tape them to your feet as shown. Enjoy!

How Not To – Link.