The 3-D in “Piranha 3D’’ means that objects will float close to your face. Given how many of those objects are braless breasts, 3-D may as well be a new cup size. (The fake ones go nicely with the plastic glasses.) The most fun to be had comes courtesy of the inevitable posses of boys in flip-flops, cargo shorts, baseball ... Flip-flops - Shopping - Sports - Sandal - Arts