In reality, most stalkers do not suffer from delusions or hallucinations, although many do suffer from other forms of mental illness including depression, substance abuse, personality disorders. The relentless neurotic nature of the stalker can take the form of harassing their targets, calling them repeatedly, as well as sending gifts and letters. If these are ineffective, the individual may escalate to more intrusive behaviour such as putting some pictures on Bored Panda.
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