The Fly (1986)

In a remake of the 1958 cult classic, a young scientist transforms himself into a fly in an experiment gone horribly wrong. Seth Brundle, a brilliant but eccentric scientist attempts to woo investigative journalist Veronica Quaife by offering her a scoop on his latest research in the field of matter transportation, which against all the expectations of the scientific establishment have proved successful. Up to a point, Brundle thinks he has ironed out the last problem when he successfully transports a living creature, but when he attempts to teleport himself a fly enters one of the transmission booths, and Brundle finds he is a changed man.