You've most likely heard of "The Asylum" and just aren't aware of it. They popped up a few years back and made their name by making shameless cash-ins on mainstream movies (knowingly, of course). Basically they get about 10$ together, some slumming C-listers, and come up with their best "porn spoof name" to capitalize on a new release. Of course it's all cleverly planned out so the film is on Blockbuster's shelves right around the time of the theatrical release in question. And presumably (?), some people are actually stupid enough to rent it.