Lol, those are called Space monkey's man...lol. Here we have someone stand against a wall, breath hard for 2 minutes then take a huge breath and have someone push on their chest untill they pass out, I did it to my best friend cause he thought it would be funny to do while we were in summer school, when the teacher was walking in( I never had it done to me cause I thought they were stupid) and he passed out and had like a mini siezure lol.. He was fine after like 15 seconds though. and he got up and he didnt seem wierded out or anything, he said he didnt remember shit lol, he just remembered everything going black.