The Celtic Knotwork Biohazard Shirt.

The ultimate statement of... well... something. Something dangerous, but weirdly attractive. Something complicated, and just a little bit twisted.

If you're it, you ought to wear the label. It's only fair.

On the other hand, it could just as easily be a timely warning that the excavation you're about to complete is the resting place of an Evil Out of Time and Space; perhaps the Tomb of Balor, or some Fomorian Fane of Feckless Fascination and, ultimately, of a Doom so universal and unstoppable that no living thing can hope to escape its remorseless, relentless advance on modern civilization.

The sort of early warning system that the ancients carved with great labor and craftsmansip in the vain hope that you - yes, you! - would be clever enough to understand its hidden, interlaced, encoded meaning, which - roughly translated - is: Don't even think about opening this door. We really mean it.

Or, on the other hand, it might just be a T-shirt. Some things are.