If you manage to crack your screen by jabbing it with your thumb, I would expect the ghost of Bruce Lee to appear and ask you to teach him your way of kung fu.

If you manage to crack your screen by jabbing it with your thumb, I would expect the ghost of Bruce Lee to appear and ask you to teach him your way of kung fu. The PSI required would liquefy your thumb. I could maybe see accidentally bending your phone with a death grip. But, even that requires a serious strain: http://i.ytimg.com/vi/FwM4ypi3at0/maxresdefault.jpg http://i.ytimg.com/vi/FwM4ypi3at0/maxresdefault.jpg