This one I never read the book to. I probably should but it's like 1000 freaking pages and the Kindle version probably costs $18. Anyway, I think they're remaking it as a movie but back in the early 90s there was a miniseries on ABC based on the book starring Tim Curry as the creepy clown who terrorizes a group of people first as kids and then 30 years or so later as adults.
So like the first time the meddling kids stop the clown, but 30 years later he comes back starts to kill them one-by-one. They eventually confront him in his underground lair, where he turns into a giant spider or some shit. I haven't seen the movie since it came out, but the effects are probably kind of cheesy by modern standards. It was definitely creepy when I saw it, though I was like 13 or 14 or something back then. A lot of people think of Tim Curry from Rocky Horror Picture Show but I remember him more from It--and the crappy Annie movie my sister made me watch about 200 times. I can't say it made me afraid of clowns, though it certainly didn't make me like them.
I'm not sure how a new version will stack up, if it even gets finished. And maybe at some point I'll get around to reading the book. Though probably not.