Madman

Tom worked like a madman.

Zen's latest mission is to save the Earth from ecological destruction at the hands of a plant-destroying madman.

A madman is not accountable for his actions.

He acted like a madman.

The only difference between me and a madman is that I'm not mad.

Many people also considered him a madman.

He behaved like a madman.

That madman broke the window.

While laughing is allowed, it is most dishonest to laugh out loud or to extend one's laughter beyond the limits of a just moderation; the Holy Ghost teaches us that it is the character of a madman to raise one's voice while laughing.

In here, I look like a madman who just escaped from the lunatic asylum.