I started a screen play awhile back
premise: aliens rejected from their home planet come to earth and invade human hosts. The KIND of human they are looking for is:
a couch potato or a negative shopper who is rude and inconsiderate and argumentative or
an actual “illegal” status alien
they thrive on junk food, negativity and other undesirable human traits. So how do you know who’s an alien?
it’s simple really. All you need is a can of bug killer. They melt on contact. Since shopping is high on their list of things to do salespeople have designated certain floor responsibilities to the more macho people – they carry belts with bug spray cans inserted.