
Lunacy
Common Hyperbole
 Often used to exaggerate a point or show disapproval of an idea or action. 
Selling your house to buy lottery tickets is pure lunacy!
 Casual Expression
 Used informally to express disagreement or disbelief in casual conversation. 
You're biking across the country with no training? That's lunacy!
 Emotional Impact
 Conveys strong emotions; can be seen as offensive if directed at a person. 
When he proposed building a house on the moon, everyone shouted, 'Lunacy!'