Flatulence theoretically produces a microscopic amount of forward propulsive thrust in a total vacuum

Newton's third law of motion dictates that every action has an equal and opposite reaction, and yes, that applies to your flatulence. If you found yourself perfectly untethered in the vacuum of space, releasing a high-velocity bodily gas would theoretically propel you forward by a fraction of a millimeter. It's the most undignified method of space travel ever conceptualized.