Halve each pear lengthwise and scoop out the core with a melon baller or small spoon. Dip cut sides in lemon water and pat dry.
Place each pear half cut-side down on the serving tray. The wide base is the bat's body and the narrow tip is the tail.
Press one pretzel twist firmly into each side of the pear half at the widest point, angling it outward and slightly upward to look like open wings.
Dab a small amount of cream cheese on the narrow tip end of the pear.
Press one dark grape onto the cream cheese as the bat's head.
Add a tiny dab of cream cheese on the grape and press two mini chocolate chips in for eyes.
Serve immediately or refrigerate loosely covered for up to 1 hour.