Slice the pineapples into rings, removing the cores. Sizzle the bacon at 325F in a skillet, flipping every 10 minutes until done. Grill the pineapple slices at 375F until slightly charred. Cook the pancakes in a buttered skillet at 375F, placing the pineapples and blueberries as soon as you pour the batter. When the bubbles stop, flip them. Assemble the pancakes with the bacon slices on the fruit side, drizzle with maple syrup, and enjoy!