The Lawnmower Man

A reasonably benevolent scientist decides to test his virtual reality computer program on a mentally-retarded young gardener who has often been brutally taunted, teased and exploited. The experiment, which sends nearly-real computer generated impulses to the man's brain, results in the gardener growing ever more intelligent. As his perceptive ability crosses into the extra-sensory, he seeks revenge on those who used to humiliate and hurt him. (official distributor synopsis)