Title: It (2017)
"We all float down here"
So many to choose from like Stan being attacked by his personal fear of "Mama" look alike's portrait in his father's office coming to life with Mama's elongated smoky, shadowy limbs and Alpe wesen teeth from Grimm...
The scariest, most WTF moment in IT has to be:
(Clip from Movieclips and Mashups)
"Nearly stormed out of the theater screaming and running aimlessly if there weren't teens in my way."