if u tip,fall,car hit u or anything u will first need to protect your face!
1] IF U TRIP
first and formost this you have to do is put hand down 
[if that is not happening then just imaginhe shit is in frount of u and automatically put your hands down]
2]IF YOU GET HIT BY A CAR OR BUFFALO OR YOU ARE FALLING FROM A HEIGHT  ETC...
u need to roll just 0.00001 seconds after ur feet touch the ground 
[only 0.01 % chance of surviving]
tip taken from action movie 
3]IF YOU GET TRAPPED IN SOMETHIGN AND FALL OF A BUILDING ETC..
jump 2 seconds before the box hits the groud
0 to 00.000000000001 percent chance of surviving 

WARNING - DONT TRY AT HOME
MADE FOR FUN PURPOSE