Lay each pepper half cut side up on a board. Press two olive rounds into the upper third of each half for eyes, pushing lightly so they hold.
Press one olive round, slightly lower, in an oval or open-circle shape to suggest a surprised ghost mouth.
Pour the black bean dip into a small black bowl and place it at one end of a long rectangular board.
Arrange the ghost peppers in a row next to the dip bowl, spacing them evenly along the board.
Fill the remaining space with corn chips and dark grape clusters.
Serve within 2 hours. The assembled board can be refrigerated, uncovered, for up to 3 hours before serving.