2. Quickly inhale and exhale for around 20-30 seconds. You must get a little dizzy.
3. Stand up.
4. Put your thumb into your mouth and "blow air into it".
5. Hold it for few seconds until you think you're dizzy enough.
6. Quickly lie down, watch out for your head.
Found this on 4chan. I know playing with oxygen is not safe, but I do it sometimes when I'm bored. Lol

It will last like 20 seconds, first you'll most likely pass out for 2-3 seconds, then you'll have no idea who you are, where you are, and what are you doing here. Then your memory will come back, your body will feel amazing. Just try that already.