I dreamed I found an enormous white worm in my bed. Like, the pure white of a pinworm, but almost the size of a small earthworm, and with the segments of an earthworm. I woke up all freaked out and was about to take a dose of Combantrin, aka, really really disgusting liquid dewormer, when I realized I must have dreamed it because actual parasitic pinworms look nothing like that. Eww.

I am immensely amused to find that Webster 1913's only example for the word parasitic is "preacher".