I remember playing this in elementary school. I guess we tried to shorten ours a little, but we used to sit on the floor and start by karate chopping each others backs and do the concentration chant..... concentration, concentration. People dying, children crying, concentration. Crack an egg on your head and have the yolk coming down 3x. Concentration chorus.
Stab a knife in your back with the blood dripping down 3x.
Concentration chorus.
Then we'd always say spiders crawling up the wall and tickle our fingers up the other persons back and then when you get to their shoulders squeeze real hard and blow air on their necks and say now you got the chills, but I have played it with the building idea too... I guess it never worked for us so we decided to switch it up.