stirrer /ˈstəːrə/
noun
1.
an object or mechanical device used for stirring something.
2.
INFORMAL•BRITISH
a person who deliberately causes trouble between others by spreading rumours or gossip.
I planted the stirrers at the counter of random coffee shops in London for consumers to discover, whilst contemplating how to live their life over a coffee. The stirrers work best when paired with long life milk.