Heres an interesting article.
http://www.bbc.com/earth/story/20141221-truffles-contain-bliss-molecule
'Maccarrone believes truffles use it to attract animals to eat their fruiting bodies, so that their spores are spread more widely and they have a better chance of reproducing.'
I wonder if there are other fungi/ plants that rely on humans in particular to spread spores/ seed.