Even your blood can smell things. In an experiment, scientists put blood cells on one side of a chamber and an aromatic compound that reacted with their scent receptors on the other, and watched in fascination (or perhaps abject horror) as the blood moved toward the scent. Getting more Cronenbergian by the minute here, aren't we? Well hold on, because it gets weirder:
You know what can also smell? Sperm.
"Guys, smell that? I think we went the wrong way."
And not just "like a teenager's bedroom" either. It's suggested that sperm use smell receptors to hunt out a woman's egg like bloodhounds. Now picture a penis firing out a billion tiny writhing creatures, each hungrily huffing the air around them, trying to track down what they all collectively want.
Supersize that scene, slap some spikes on it, and you got a pretty solid sequel to The Thing.