When I was a kid, I had this fascination with horror movies even though I was afraid of them. If I came across one on TV, I would be compelled to watch it until I got too scared and had to change the channel.
I can't remember how old I was, but I distinctly remember watching a large portion of a sort of haunted house movie on either TNT or TBS (pretty sure it was a Turner network). I remember there was a group of kids trapped in this house with monsters in the walls, melting people, monsters disguised as people, and a lot of stop-motion and practical effects. I never saw the beginning or end of it, and I never found out what it was called, but I've had images from it running through my mind since the early or mid 90's.
Then, the other day, I was browsing Tubi TV for random movies and checking YouTube for their trailers, and I came across what must be THAT movie:
It's called The Gate, and it's about some kids who accidentally open a portal to hell (or somesuch) in their house.
I cannot believe I finally found it after all these years, and without even looking. I haven't watched it yet; I'm kind of afraid to ruin the mystique by finally seeing it clearly and in full. But I'll get to it eventually.