David Harbour is Ernest the friendly ghost in 'We Have a Ghost' trailer

One of the top ten rules of cinema dictates that whenever a family moves into a new home for a fresh start, there's sure to be a ghost lurking in the shadows. 

Based on the short story "Ernest" by Geoff Manaugh, Netflix's We Have a Ghost follows a teenage boy's discovery of a ghost in his new home, that's played by none other...