Dark Sanity (also released as Straight Jacket) is a 1982 American psychological slasher film directed by Martin Green and starring Aldo Ray, Chuck Jamison, and Kory Clark.

After being released from a hospital, Karen and her businessman husband Alan relocate from San Diego to a home in the Los Angeles hills.

Just after moving in, Karen meets her neighbor, Madge Harper, a talkative middle-aged woman who resides across the street with her husband, Henry.

While attempting to find the cat, Karen and Benny discover Lucy's severed head beneath a crawlspace entry in a closet.

Cavett Binion of AllMovie wrote: "Poor performances and slack pacing derail most of the suspense and reveal the rank amateurism of the filmmakers.

"[4] Gary Dobbs of the Rhondda Leader praised the film, calling it a "curio" and "virtually bloodless but a brilliant psychological thriller that really raises the viewer's hackles.

[4] The United Kingdom-based distributor VIPCO issued a VHS under the Dark Sanity title in 1983,[6] followed by another release from the Canadian-based Marquis Entertainment in 1984.