The Undertaker and His Pals (1966) Slapstick Horror Comedy About Cannibalism

A fun kooky enjoyable cartoonish horror comedy with decent character actors, great original soundtrack, and a cynical social statement on the funeral industry racket.
*This is my own custom fan-edit using some additional and extended footage from the trailer that was missing from the feature film.
Plot:
A biker gang consisting of an undertaker and his two friends who own a local diner, make business by going out on the town and killing people at random by picking names from the phonebook; the diner-owners use body parts for their menu, the undertaker sells his services of their grieving families to buries the rest. A private investigator discovers the plot and tries to put an end to the spree of murders.