Well, I can't beat this one for insane creepyness:
"If you want romance, honey, you don't have to read about it."
Dodgy enough on it's own, but in context, downright creepy.
Why?
Well, this was at an open-air market.
I was going through the stuff at a stall selling used books.
Now, I was actually looking through the science fiction, but the romance novels were to my left.
So... This guy comes up to me, and feeds me that line...
Thing is, I was twelve, and by the looks of him, he was about 35...
Yeah...
As if the line itself wasn't disturbing enough... >_<