I roll a fair 100 sided dice.

Eliezer asks me to state my confidence that I won't roll a 1.

I say I am 99% confident I won't roll a 1, using basic math.

Eliezer says "AHA, you idiot, I checked all of your past predictions and when you predicted something with confidence 99%, it only happened 90% of the time! So you can't say you're 99% confident that you won't roll a 1"

I am impressed by the ability of my past predictions to affect the roll of a dice, and promptly run off to become a wizard.