The Creeping Terror is considered by experts to be one of the worst movies of all time. It gets my vote for that despite my having seen Plan 9 From Outer Space. The following is the Mystery Science Theater 3000 episode with it...
Oh, man, I saw that in my youth. Late-night TV.
You could see the guys' legs moving under the carpet that was supposed to be the creature's millipede-like sides. I guess.
It never could get faster than a crawl (hence the "creeping" part o the terror, I guess), yet it kept running down these comely ladies and drawing them under the carpet to get munched up. It was kinda pervy, because they made a show of looking up the ladies' skirts as they were disappearing into the .... the... well, whatever it was.
It was awful.