In Kill Bill Vol.2 Uma is buried alive in a coffin several feet below ground. My friend and I both believe if you trained like she did you could bust the board even if it hurt your hand but we disagree that she could slide up through the dirt as the dirt fell into the coffin. There seems to be lots of scientific variables that could be tested such as amount and weight of the dirt and how much air would she have and when she broke the top of the coffin open would she be able to displace the dirt in the coffin in order to get up with out running out of air or being crushed.

Tested and busted on the show.