The jokes over as Adam Scott is taking a break from comedy and moving over to horror. The star of Step Brothers and Knocked Up is going to have to watch his step when he toplines Alex Aja’s Piranha 3D, the remake of Joe Dante’s classic film from 1978, reports Moviehole.net. The film, starring Elisabeth Shue, is set in Lake Havasu, Arizona, where a tremor causes the lake’s floor to open, setting free scores of prehistoric piranhas. It’s up to Shue’s character, the local Sheriff, and her teenage son, to essentially save the day. Scott will play Novak, a diver for the US Geological Service who helps discover the piranha outbreak. The remake hits theaters May 19, 2010.