Devil's Coach Horse

What’s this bug?
I was working on a car in Azusa, CA, and saw this bug coming towards me. I stopped and bent down to look at it, and the wind from my pants made it do what it’s doing in the picture. I’ll continue to have bad dreams about this bug until I find out what the heck it is. Please help.

Hi Kevin,
Despite its aggressive posturing, the Devil’s Coach Horse is harmless. It is a European import and we love them in our garden where they prey upon snails and slugs.

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