Rob Savage's 'Host' plays out like the greatest hits of found footage. It takes the scariest elements of genre favorites like 'The Blair Witch Project' (1999) and 'Paranormal Activity' (2007) and delivers a shock every few minutes. It is edited, crafted, and scripted well. The relaxed, naturalistic performances from the actors immediately create a sense of believability that helps when things start getting scary. A deceptively simple yet downright terrifying thrill ride.