It's been 40 years since audiences were first asked "Who you gonna call …?" "Ghostbusters" was released in 1984, instantly becoming a hit, thanks to its funny, original script and catchy theme song.

The film that spawned a multibillion-dollar brand and gave the world an unforgettable theme song turns 40 this year. If that makes you feel decrepit, you’re not alone. I saw the original “Ghostbusters ...