desmoinesregister.com — OSCEOLA, IA. - Gone is Mr. Terrible, the iconic 132-foot-tall electronic cowboy who stood for years here along Interstate Highway 35, beckoning gamblers to Terrible's Lakeside Casino. Unfortunately, the mascot's moniker too aptly described the status of business inside. Long a favorite getaway for Des Moines area residents, the casino has endured hard times in recent years.