Peel the hardboiled eggs and wash them clean of shells.

Cut eggs into equal halves.

Separate the egg yolk from the white, putting the yolks into a bowl.

Mash egg yolks and add mayonnaise and mustard.

Stir until combined.

Salt and pepper to taste.

Fill each egg white half with the yolk mixture.

Cut whole black olives in half. 

Use one half of the spider body in the middle of the egg.

Cut the other half of the olive into 8 small slices.

Arrange slices as the spider legs.