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This is a recount by the person that decided to do this vid.

In researching for my haunted house, I decided to look for synthetic ways to induce fear. I found a few and this is one :) Meduna's mixture of co2 and oxygen. It works because our air is only 20% oxygen, and mostly nitrogen, but our body is wired to freak out when it gets too much co2 (it thinks you are suffocating).

I bought oxygen off ebay (canned air for mountain climbers) and used the co2 from our sodastream. The first breath: you immediately feel like you've been holding your breath for a minute, second and third breath you start to feel burning in your face and arms. After this you have a general feeling of unease and get a jolt of adrenalin.

This is very effective, and completely safe. and because the adrenalin takes a while to wear off this should prime my participants for the rest of the night :)