This mushroom - thought to be a specimen of Clathrus archeri, or Devils Fingers - takes the cake for being the strangest and creepiest specimen of a fungus looking like something else. It looks like a cold, dead hand reaching out to pull the rest of the zombie body out of the earth. Those even look like tattered sleeves down by the wrists of the hands.
Dicty! Dictyosteliida, a type of slime mold. They live as individuals until food runs out, then they form sporangia. They release a signal molecule into the environment that allows them to bunch together. They join into a tiny slug-like creature, which moves to an open place and develops into a fruiting body. Some of the amoebae become spores to begin the next generation, and some sacrifice themselves to become the dead stalk, thus lifting the spores up into the air for better dispersal.