Venezuela’s opposition protests on Wednesday may be the messiest in a six-week wave of unrest as demonstrators prepare to throw feces at security forces, adding to the customary rocks, petrol bombs and tear gas.

The new tactic has been dubbed the “Poopootov” in a play on the Molotov cocktails often seen at streets protests in Venezuela.

“They have gas; we have excrement,” reads an image floating around social media to advertise Wednesday’s “Shit March.”