Street light interference (SLI) is a term coined by paranormal author Hilary Evans to denote the claimed ability of individuals to turn street lights or outside building security lights on or off when passing near them. Believers in SLI allege that they experience it on a regular basis with specific lamps and street lights and more frequently than chance would explain; however, SLI has never been demonstrated to occur in a scientific experiment, and those who claim the ability have been found to be unable to reproduce the effect on demand.