MacReady: It's obvious that the bastard's got lyme disease.
Pardy: What?
MacReady: Lyme disease. You touch some deer feces, and then you... eat a sandwich without washin' your hands. You got your lyme disease!
Pardy: And that makes you look like a squid? 
Yeah, I have lyme disease, so that line was fucking hilarious. My friend Phil put some brownies in a sandwich and gave it to me. When I asked him what the hell it was, he said is was a deer feces sandwich like the one that gave me lyme disease. 
I also liked the line when MacReady said "If I wasn't shittin' my pants right now, I'd be fuckin' fascinated."
I heard that James Gunn (writer/director who also wrote the 
Dawn of the Dead remake) never even saw 
Night of the Creeps. It was more 
Slugs and 
Shivers.
Cover to Cronenberg's 
Shivers. Same premise, but the parasites turn their victims into 
sex-crazed, violent zombies. 

Look familiar?