It shakes and rattles with the fastest rhythm this side of a New Orleans jazz joint, which is probably fitting for a plug made in Louisiana. When the fish like it hot, a speeding Rat-L-Trap is often the only answer. A broad head gives vibrating action in the water (hence the common nickname: lipless crankbait), internal beads make noise like an underwater mariachi band, and a herringlike shape imitates common forage fish such as shad and alewives. In a range of sizes from 1.8 to 11.2 ounces, 'Traps have been catching everything from smallmouths to crappies to seatrout since the late 1960s. Fish don't have time to think about a speeding 'Trap; they just whack it.