Shriek of the Mutilated (1974)
Abysmal film with a great title. Professor takes a group of students to an island in search of a Yeti. (Mind you, this takes place in North America.) He also treats one student to a special meal at a special restaurant, telegraphing our Shocking Twist Ending.
Before the group leaves, some guy who was on a similar expedition freaks out at a party and relates how everybody but him got killed by the Yeti. (You get to hear the instrumental hit song "Popcorn" by Hot Butter at the party, because somebody is making popcorn.) Later, in a bizarrely unrelated subplot, this guy cuts his wife's throat and gets into the bathtub with all his clothes on. Amazingly, she's still alive, and crawls from the kitchen to the bathroom in order to electrocute him by throwing a toaster in the tub.)
The island is inhabited by one guy and his Native American manservant, patronizingly calling him "My Indian." Long and excruciatingly slow story short, folks get killed by the Yeti (some guy in a really fake white fur suit, which also telegraphs our Shocking Twist Ending.) One victim's severed leg is used as bait to attract the Yeti; later, an entire body is used the same way. The Shocking Twist Ending arrives, and the movie drags on for a while.
It's really bad. The version I watched seems to have cut out a lot of gore, which is OK with me. What's left is mostly a lot of people talking.