How to make yourself faint?

I heard of the second way when your friend presses on your chest after you take a few deep breathes and you hold the last on in or you do the same thing hold your breath and then they Graf your neck and puch in while your back is against the wal vie seen it done a few times both ways but you need more the one friend you need 3 one to push and one to stand on each side so when you fall they cathch you but it can get scary one time my friend let the boys do it to her and it was so hard to wake her up we were slapping her and she finely woke up but this one kid did it and didn't have people standing next to him to catch him and when he passed out he fell and smacked his head on a table.then the floor I was so freaked out cause it was when I was younger and it was in my house but he was fi e but it took so long to get him up he had a concussion but I never had it done to me heck no I was like the only one that said nooooo lol but there the only way I ever heard of