Why do earthworms come out in the rain during April Fool's?

Earthworms often come to the surface during rain to avoid drowning in saturated soil and to find new habitats. The wet conditions reduce the risk of desiccation, allowing them to move more freely. April Fool's Day coincides with spring rains in many regions, which may lead to a noticeable appearance of earthworms, but the behavior itself is not linked to the holiday.