What if the whole world is a product of your imagination, and you are the single intelligent being existing?
^ To support that. WHAT IF YOU AND ME ARE ONE SOUL LIVING IN A DIFFERENT BODY. OR.ONE SOUL IN A DIFFERENT BODY TIMELINE. Stating that... One of us travelled through time and is stucked on either's time. Gross... What kind of incest do people do then...? >_> I am talking to myself. Or what if we are the mirror. Darn... My mind is all fired up (and it's night) XD
what if our dreams are the only glimpse of the real world? All your dreams and nightmares are truth,and reality is the dream? SPOOKY lol
What if you already died and this is just your life flashing before your eyes very slowly? What if this is just a dream and when you die you actually wake up in the real world? What if this is all just a computer stimulation and the people you call friends and family are in a different stimulation and you just happen to collide. The strangers you meet on the street are bots and someone arranges your life and who you meet. Like the Sims
I don't really know about your oxygen Hypothesis/Question, but I am sure that we use oxygen as our source to breath. If there was an alternative (which there is) you may use it to yourself. They are called Oxygen Bars believe or not. They sell you Oxygen but cleaner Oxygen (apparently our normal Oxygen is to dirty?) anyways that's the alternative or at least one of them.
Its like this. Life is like a phone call, once the call you have made is disconnected the energy is then re-routed to another call, the energy will always remain however the call does not.