Fainting

About a month ago, one of my friends taught me how to make people faint. I didnt think it worked so I tried it. I dont remeber exactly what happened but when I woke up I was on the floor, my head ached, and I was disoriented.
Kids, dont try this at home.
HOW TO MAKE SOMEONE FAINT
1.Tell them to get against a hard surface (wall perferably)
2. Tell them to squat and hyperventilate for 30 seconds
3. Tell them to get up and hold their breath.
4.Push very hard against their stomach while they are holding their breath.
There you have it.
WARNING THIS COULD CAUSE BRAIN DAMAGE I AM WARNING YOU SO DONT SUE ME
-Fire