Criminal mischief under Florida Statute § 806.13 means willfully and maliciously injuring or defacing property. Damage under $200 is a second-degree misdemeanor, $200 to $1,000 is a first-degree misdemeanor, and over $1,000 is a third-degree felony; damage involving a firefighter or law enforcement animal carries special provisions. Defenses include accidental damage (lack of willfulness), disputes over valuation, and identification issues.