La Mano Negra
A dark hand that pops out of the ground to grab kids who are too dumb to come inside when it's dark.
My brother ran out of the house screaming because he saw La Mano Negra in the street.
My friend's dog barked at La Mano Negra and scared it away.
My sister said she saw La Mano Negra in the kitchen and hid under the table.