Make an air powered bazooka (harmless), shooting plastic capsules. To make, you need a vacuum cleaner, PVC Tube, some ducttape and suitables stuff to launch. Big fun for almost nothing. The complete building instructions are on www.instructables.com/member/ynze
cool i wana make one
This may be the most amazing use for vacuum pressure I’ve ever seen.
Perhaps, even beating out making enormous marshmallows…