The trailer for "Piranha 3-D" is now online. Don't confuse this with "Mega Piranha," which we debuted the trailer for last month. That movie features a fish eating a helicopter and the acting talents of pop star Tiffany. "Piranha 3-D," which hits theaters on August 27 features Christopher Lloyd and Richard Dreyfus. Tough call. Might as well see both. Check out the trailer for "Piranha 3-D" below.