I still say pee in your mouth. Nothing says "I mean business" more than a mouthful of hot urine.
Why not just blindfold her family, piss on them, and blame it on Martians?
That's too elaborate methinks. Peeing in your mouth is quick, and it gets results.
Then you would have to get me in a position where I'm standing still, have my mouth open, and you're at a good enough height to do it. Unless, of course, the first step of the plan is to break all her limbs after you stalked her into a shopping mall and crack open her jaw before relieving yourself in front of many scared Christmas shoppers.