Here are the best gateway horror and horror-ish movies for the non-horror fan.
Alien. 20th Century Fox. ...
Blue Velvet. De Laurentiis Entertainment Group. ...
Bug. Lionsgate. ...
The 'Burbs. Universal Pictures. ...
The Cabinet of Dr. Caligari. ...
Don't Look Now. Paramount Pictures. ...
Duel. Universal Pictures. ...
The Exorcist. Warner Bros.