The logical reason the image is a struggle for some is that it is reality; not faked...
I know of someone who saw the original Alien film and within a few days had to do some work on the aircon system of a 747-100, nicknamed the "octopus" (it is just forward of the wheel-wells, centre fuel tank and wing spars, and totally blocks off the front and rear hold areas, so the sequence in Airforce One is a nonsense)...
The airline in question (naming no airlines for legal reasons) was known for having "wildlife" issues and used to ply exotic locations too and from the home country and LHR...
Imagine the final sequence when Ripley is settling Jones the cat and is working around the pipework when something moves that shouldn't orta move...
The engineer in question, working in semi-darkness, had something right in front of his face, black and rounded and shiney, move...
He ran out of the cargo-hold, having wet himself and semi scared witless...
Turned out to be a tropical beetle, stunned by fumigation products and the British winter...
Amazing what the eye can see and how the mind can play games with that vision...
I remember as a little kid, sneaking down the stairs and watching "The Blob" through the banisters - I suffered recurrent nightmares for many years after that...
The ones I like are the ones that make you jump when you least expect it, like the end sequence of Carrie, or the petri-dish in Carpenter's The Thing, or several moments in that original Alien, like the chest-burster...
