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 #77664 posted on 05/21/2014 6:24 p.m.
Q:

Dear 100 Hour Board,

"Do cats eat bats?"

Merry-go-Lamb

A:

Dear Alice,

Do bats eat cats? You see, as I can't answer either question, it doesn't matter which way I put it.

-Ozymandias

A:

Dear you,

Alternately, yes.

~Anne, Certainly