Question: What disappears as soon as you say it?

Question: Can you make VI out of IX?

Question: Spell "Hard Water" using only 3 letters.

Question: What has four legs, breathes, but doesn't move?

Question: I'm the one that gives you information, I'm the one that lets you have the ability to control yourself, I'm the one that stores all memories and without me you'll be dead in a instant. What am I?