This is a Horror Film (spoilers, possibly)
I have always been addicted to horror movies and have seen almost every horror film you can think of! From Romero's zombie movies, to Nosferatu (1922) it's even getting hard to find good horror I've not yet seen.
However, ever since being a child there was always something creepy and even terrifying about Willy Wonka & the Chocolate Factory. There's something about a film that pretends it's not supposed to scare you or at the very least make you uneasy.
Everybody knows about the infamous Wonkatania boat scene, but just the way that Wonka acts! Pure psychopath/sociopath.
Wonka always tries to assure people that there's no danger in his factory and that his victims will be alright. But how do we know for sure? Just because he says so? The movie ends before we can verify if anybody actually did survive other than Wonka and our "heroes".
Honestly, I've seen MANY horror films that are WAY LESS scary (and they're not even "bad" horror films), so what does that tell you?
I also found some trailers of this film that show it as the horror film it truly is:
https://www.youtube.com/watch?v=o9Cby33ZR98
https://www.youtube.com/watch?v=bQ_fEM1vYeQ
https://www.youtube.com/watch?v=6Jx7qM1Ru5c
https://www.youtube.com/watch?v=D2NFIWvNMLE
https://www.youtube.com/watch?v=tGExElaKDaU
http://www.youtube.com/watch?v=5t8peKvzfnw
http://www.youtube.com/watch?v=0StNLTS3WOA
https://www.youtube.com/watch?v=bbbxutN0G2w
https://www.youtube.com/watch?v=BjCQWIbtt6w
https://www.youtube.com/watch?v=69cO0ijQjQw
This may give people afraid of demons nightmares:
https://www.youtube.com/watch?v=cVTGN9Uuf2U
No one in their right mind would ride on a buggy driven by Klaus Kinski.