Ravens are smart enough to play tricks on each other. If a raven knows it can be seen by other ravens, it sometimes pretends to stash its food in one place while secretly hiding it elsewhere so onlookers can’t steal it. This tactic doesn’t always work, however, because the ravens who were watching are often just as intelligent as the raven who was trying to trick them in the first place. (, , )

Inspired by a similar plan in Canada, police in the UK gave out free lollipops at the door of a nightclub to reduce rowdiness after closing time. The idea was that drunken, late-night clubbers wouldn’t be inclined to shout or cause a disturbance while they were sucking on them. It worked. ()