The 50-50-90 rule: Anytime you have a 50-50 chance of getting something right, there's a 90% probability you'll get it wrong.
Question #109 posted on 08/21/2003 midnight
Q:

Dear 100 Hour Board,
If there happened to be a hole all the way through the entire earth, straight up and down, and you were invincible and didn't die in the hot magma, after you fell past the center, how far up would you be able to go against gravity? Would you get up to the other side?
- Run-ons and coherency never were my strong points

A: Dear Run-ons and coherency never were my strong points,
Not far. In theory if the heat didn't kill you, the gravity would just about rip your body apart. So if you were immune to that as well our weak bodies would be utterly powerless against the gravity. Or in other words you would be stuck there in the middle of the earth.
- The captain.