Use "certifiably" in a sentence

1. “You are certifiably insane, do you know that?!” Fury and worry were in his eyes

2. Just in passing, it should be noted that Rousseau was certifiably insane

3. Wouldn’t you, if you had no other alternative except to remain a reflective negative weak bit of energy, a non-entity, forgotten and in a black hole of isolation and misery for how many years until you become certifiably insane? What would you do for 10,000 years after you die physically, eh? Refrain form doing this when it is the only way you can ever be alive again? When you can experience over and over a newborn babies sense of Pure Wonder and poison it as quickly and as efficiently as possible? And make sure that the unborn soul you poison will never grow to be strong enough to come after you fro what you have done to it? Face the human logic of this: this is what happens

4. 5% of the population is certifiably mad