How could you make my knotwork Skull and Crossbones even more ominous? How could you turn my knotwork Biohazard into a warning of something even more perilous? How could you get that peanut butter in my chocolate?

At least two of those problems can be solved in just this way.

Take the complicated, dangerous knotwork Biohazard symbol and... invert it. Turn it right on end. That's got to mean something scary.

Then drop the Skull and Crossbones on top of it just to make sure nobody, but nobody, is going to think this is all about something warm and fuzzy. What do you get?

Well. You get this, which is a little something I like to call the Double Threat.

No idea what it means... but that's not the point. If you take the time to ask what it means, you've stayed too long in the Zone of Peril. That's right. The Zone of Peril.

When it's all capitalized like that, you just know you're not getting out of this one alive.

So there you have it: The Double Threat Skull. Enforcing natural selection while conveniently decorating your torso.