Cockleburrrrrr...

Photo by Dan Weisz 1/12/2016

Yes, Patricia, it's a fruit! Specifically, a fruit of the Common Cocklebur (Xanthium strumarium). Looks pretty cold, too. (Those white specks are frost.)

From the Firefly Forest link above:

The seeds and cotyledons are dangerously poisonous and contain the highly toxic glycoside carboxyatractyloside.

In short, it's very, very bad for animals, especially mammals.
In shorter, do not eat.