Common
Tinkerbell effect
American expression about belief and existence
Tinkerbell effect
The "Tinkerbell effect" is an American English expression describing the phenomenon of thinking something exists only because people believe in it. The effect is named after Tinker Bell, the fairy in the play Peter Pan, who is revived from near death by the belief of the audience. The opposite form is called the "reverse Tinkerbell effect", a term coined by David Post in 2003. It stipulates that the more you believe in something the more likely it is to vanish. For example, as more people believe that driving is safe, more people will drive carelessly, in turn making driving less safe.
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