Deadly Weapons is a 1974 American exploitation film directed and produced by Doris Wishman.
Crystal is an advertising executive who tracks down the mobsters who killed her boyfriend.
A clip from the film is featured in John Waters's Serial Mom.
In 1986, Waters told David Letterman about visiting the White House at the invitation of the Deputy Advisor of Political Affairs and was delighted to find they shared an appreciation of the film.
[1] Double Agent 73, also directed by Wishman, is an ostensible sequel to Deadly Weapons.