Heat a nonstick skillet over medium-high heat. Holding a shrimp, nest a chunk of pineapple in the natural curve of the shrimp then wrap bacon around the shrimp and pineapple and secure with a wooden toothpick. Wrap and secure all 12 shrimp then add to the hot pan and cook 3 minutes on each side or until bacon is crisp and shrimp are opaque and firm