Is This Some Kind of Threat?

This will be our first Halloween in Berkeley, and apparently there's pressure for us to deck out our home. Multiple neighbors have approached Kelly to say that Halloween was a pretty big deal for the old residents of our house, who were fond of elaborate decorations.

I think the neighbors sensed we weren't taking the responsibility seriously enough because I walked outside one morning to find this.

I'm not sure what to make of this, but it does seem like someone wants to send a message.

Is it the Halloween-decoration equivalent of the "Godfather" horse head?

Perhaps they've seen our parkway strip and know that we need a little prodding.