Police are investigating a severed goat head that was delivered to Tom Ricketts, owner of the Chicago Cubs, at the iconic Wrigley Field. That's weird right? Not in Chicago. Apparently this has happened before — several times.

The Cubs suffer from the Curse of the Billy Goat, you see. It's like a poor man's version of the Curse of the Great Bambino that plagued the Boston Red Sox for nearly a century. The superstition dates back to 1945 when a local tavern owner named Billy Sianis took his pet billy goat to a World Series game at Wrigley Field. The goat had its own ticket and everything, but the fans sitting near Sianis didn't take kindly to the uncommon guest. (Evidently, his breath stank.) So officials booted Sianis and his goat out of the stadium. The disgruntled fan said that the Cubs would never win a World Series again, and nearly 70 years later, they still have not.

It's unclear how many goat heads have been sent to Wrigley Field, but we count at least three: one in 2007, one in 2009 and now one in 2013. Police ultimately ruled that the two other severed goat head incidents were pranks, and there's not much of a reason to believe that this time is any different.