[header] How to creep people out [title] Stare. [step] Maintain eye contact for uncomfortably long periods without moving your eyes away from theirs. Do it in weird positions, like from the side, or peeking under your elbow to stare at the person behind you. 
[title] Use your body posture to indicate unwelcome interest levels. [step] Angle your body so that your feet and shoulders are pointed directly towards the person you are focusing on creeping out.