One of the best ways to get people to do
something is to make it fun. A marketing
campaign called ‘The Fun Theory’ found
that when stairs next to an escalator
were turned into giant, functional piano
keys, the amount of people who took the
stairs increased 66%, and when a trash
can had sound effects that made it seem
infinitely deep, people started picking up
and throwing away litter just to hear it. Source

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