Go ahead and laugh. My first thought was WOW! A dinosaur egg hatched! But then I realized how unlikely that was so I felt it and it felt rubbery but not like real rubber. A fungus? It seems to be anchored so I didn't want to damage it by pulling at it. Looking on line, I see black puffballs that closely resemble this but I don't see anything listed for Lenawee County in Michigan. What do you think it is? You can see rain water inside the hole.