*Disclaimer*
Before you attempt this, please…please be careful. I don’t mean to sound like your mother, but you could really “poke someone’s eye out!”
*End Disclaimer*

Okay, that aside, you’ll need some canned compressed air, empty 35mm film cannister, and confetti. Just spray the compressed air upside down into the film cannister, fill the can with confetti, and put the lid back on tight. Place it on the floor and walk away. BOOM!

Full instructions here.

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Via: Instructables