Erupting in a matter of hours...

from the lawn, this phallic fungus emerges on schedule in October. About a half dozen of these pungent and indecent structures have developed so far, likely triggered by the recent rains. Impressive.

Common stinkhorn (Phallus impudicus).

Odorous chemicals in the slimy cap attract insects which will collect spores and spread them to other locations.

UPDATE: The following day, still standing erect but the cap has been consumed by insects, still attracted to the pungent odors.