Certain food-based biofuels like biodiesel have always been a bad idea. Others like corn ethanol have served a useful purpose and essentially are obsoleting themselves.

Sanctions are a bad idea.

My mother had always told her kids: if you're about to do something, and you want to know if it's a bad idea, imagine seeing it printed in the paper for all the world to see.

Nothing surpasses the beauty and elegance of a bad idea.

Nothing dies harder than a bad idea.

Opposing the free flow of goods or people is a bad idea.