Stress concentration points, in theory it should happen everytime... unless it's like the crackhead banana that dies at 600 yards.
Stress riser,
dun dun dun dunnnnn dun dun dun,
Stress riser,
dun dun dun dunnnnn dun dun dun,
S-t-r-e.....s-s-r-iser...yeah, I'm not sure what's wrong with me today