Halloween is a time to indulge our darkest fears and live out our wildest fantasies. For those who like the spooky side of life, it's become a yearly event. In the two-hour Shock Docs installment, "This is Halloween," Travel Channel's paranormal experts share their best Halloween stories in a nostalgic look back at everyone's favorite haunted holiday. From creepy costumes to the scariest pranks they've ever pulled, it's a sweet and spooky trip down memory lane.