Hellfire

I found the link to the picture on View From The Porch


I found this explanation for the text on the "bumper sticker" in a comment by ed foster:

The greek reads "Molon Labe" in English. When the Persians offered to let the Spartans at Thermopolae walk away alive, the only requirement was that they lay down their weapons.
Leonidas replied "If you want our weapons, Molon Labe". It means "Come and Get Them".