The world premiere of the Piranha 3DD trailer with David Hasselhoff aired on Spike TV's 6th annual Scream awards last night. The horror movie is set to be released in U.S. theaters sometime in 2012.After Lake Victoria, the pre-historic school of blood-thirsty piranhas make their way elsewhere. This time, no one is safe as they sink their teeth into the visitors of the summer attraction The Big Wet Water Park.