You sound like you're quoting my missus. She often says: "Sometimes you just have to put the pointy hat on to let them know who they are dealing with."
She's a retired paramedic, but back in her working days I remember telling her work partner that she's a witch. He always thought it a bit cruel, so I sweetened it and said that she's a beautiful witch.
Then one day, when they had just received an emergency call, the blue lights went on, the two tone horns went on and her foot went down. But the driver of some super duper Audi was having none of that. He floored it and overtook the ambulance, but had to cut back in dangerously in order to avoid the oncoming car. My Missus, unflustered as ever, just said: "A hex on you." A few minutes later they went past the Audi. The driver had pulled it over to the side of the road, his offside front and rear tyres punctured. My Missus just smiled knowingly, her colleague did a jaw drop. Back at the ambulance station he told everyone that her husband was right, adding: "Whatever you do, never, ever mess with her."