start carrying used glass bottles around with you. if a stranger approaches to try and “make small talk” you break the bottle and point it directly at them while hissing softly.
do not wave it wildly. this makes you appear wild, chaotic and unfocused. the goal is to express madness while maintaining the appearance that you have a direct goal in mind (the direct goal being cutting them to ribbons if they don’t move to another state or maybe even a neighboring country)