Stephen King is the "King" of horror books. What is your favorite? 
My all time favorite is IT novel
Always a good choice. Did you enjoy the IT movie too? 
Yeah.  I love that movie.  That is very terrific.
The book is always better, but the 2017 movie was pretty good. The 1990 miniseries is also a classic. 
Yeah.  The movie is very scary.
Have you heard of the Steven King Multiverse theory? With the Dark Tower, The Mist, and other books being connected?  
Yes.  I heard that.  But,  Not seeing 
It all centers around ROland Deschain from the Dark Tower series. Father Callaghan from Salem's Lot is also a character in the series. 
Oh yeah.  That character is good one
Have you read all the Steven King novels? I don't want to spoil anything.