"You hang-out with these people, Casey, and a few weeks later you're a freakin' alcoholic..."

You're a groovy boy. I'd like to strap you on sometime.

I'll take half a million dollars, man. Half a million dollars and not a penny less!

"Come on, man. I doubt if you'd recognize a hippie. I'm a capitalist, baby. I work for my living, not suck off somebody else."

-Kelly, of the Kelly Affair (you might as well call them the Haircuts)

"Come in to my den, said the spider... et cetera..."

Ashley St. Ives, High Priestess of Carnality

"The portcullis bars your entrace to Elsinore!"

Z-Man- "...You will drink the black sperm of my VENGEANCE!!

OMTS, the whole movie is pretty much one favorite line. It wasn't a line in the movie, but the thing I always think of that makes me laugh is when I saw it in a theater in Chicago with a group of people from Planet Earth and this t-girl Saro during one of the party scenes yelled out "Liquor! I hardly know her!" when drinks are being offered and I literally did not stop laughing hysterically for over five minutes. I thought I was going to need an ambulance. Seriously. It was a combination of the funny dialogue and that being the first time I had ever heard the 'liquor pun'. Then as we were walking out of the theater in the snow s/he kept yelling "Hey lover! I'd really love to strap you on!" at passing cars. Ah, good times...

"Oh Porter... You have an unending capacity for counterfiet astonishment." -Aunt Susane

"what I see is beyond your dreaming" - woman with snake painted in black
I must admit this is a runner up only after aforementioned "this is my happening..." and "...the sperm of my vengence..."