Description:Twenty-eight years ago today, Ghostbusters opened in theaters and became an instant classic. ET was front and center at the film's Hollywood premiere on opening day, with Bill Murray, Dan Aykroyd and Rick Moranis in attendance. Watch the vintage footage to find out if the stars believe in ghosts! Video: Flashback: Bill Murray on Belushi & Ghostbusters "What an exciting night in show business this is," proclaimed Murray, clearly being facetious for the camera.(3:18)