creep at walmart

[Juncoph]

even if your brain is running on 21 chromosomes you probably wouldn't be dumb  enough to try abducting someone in a store with surveillance and people and one exit where many people are

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[Bear_Tracks]

exactly, you don't want to mess with him so you just ignore him/say something along the lines of not being interested rather than going beyond it

If a mentally ill person is trying to talk to you while there are not many individuals around and you ignore him or her, then the odds are that the person may react in an irrational way which could be dangerous. I've had experiences with mentally ill people before, and it is always best to just be polite. Might be different in Scotland though.