Here's another one from the golden age of home video, Blood Beach from 1981. John Saxon & Burt Young versus a creature that lies underneath the California sand!
Trailer courtesy of Shadow5920able
This is yet another trailer that rules because of its narration - “those singles.. aahhh”. Plus, the whole “just when you thought it was safe to go back into the water, you can't get to it” is pretty effing genius, if you ask me. From a marketing perspective - such as it was in the early eighties - Blood Beach is perfection.
I'm quite sure this movie is nowhere near as good as my eight-year-old brain remembers, but that trailer certainly does not disappoint.