Challenge: Plot a murder

[Anomalocaris]

Killing at random: I would visit one of those markets with machines people use to grind coffee beans, and put poison on top of the beans already in the hopper. It may take a few days to a few weeks, but someone would eventually grind the poisoned beans and take them home. 

We've spent many christmases planning out things like this in intricate detail for my mum's books. One I was particularly proud of was to mix polonium or ricin in with the glass salt / sugar / pepper shakers at some busy random motorway services. There wouldn't even be any discernible pattern when plotted on a map because everyone would be going to a different location around the country.

Except careful investigation might reveal many who were afflicted recently passed through the same motorway service within a short period of time.

Also polonium is radioactive and it’s former presence will likely be easily detected by the investigation.

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Killing at random: I would visit one of those markets with machines people use to grind coffee beans, and put poison on top of the beans already in the hopper. It may take a few days to a few weeks, but someone would eventually grind the poisoned beans and take them home. 

Killing a specific person: I would rig their headphones to explode during the second chorus of 'Dancing Queen'. 

Boru

Committing a crime from which one does not profit is as low class as petty vandalism.

To be respectable, one must get away with profiting from one’s crime.