Funny videos

just 2 lungfulls, you sure?

when someone has cardiac arrest can be even 5 min without breathing and still make it, I would have though that the human body can cope with more that just lungfulls of the wrong stuff

Yeah, what i should of said is that,* when dealing with large quantities of inert gases*, a large lungfull or two is enough to make you lose consciousness and hence fall victim. Getting Gas saftey lectures about the dangers of asphyxiants has lead to some over exaggeration.

However, it seems it's not simply a case of Oxygen displacement: http://en.wikipedia.org/wiki/Asphyxia#Nitrogen_asphyxiation

The vid shows how easy it is to pass out.