What is that movie you saw at too young an age that still haunts you to this day?

There were a couple for me:

I was young when Alien came out, but my grandfather had it on VHS soon after. Ermagherd. Still one of my favourites films.

Xtro.

But there's one I'll never forget. A woman on a boat, with a metal bucket tied to her belly, with a heat source underneath it, that contained a rat. The rat would do anything to escape the heat... and the film showed the process. I was probably 10 at the time, and it's an image/predicament I'll never forget. No idea what the film was called.