Ideas on horror!!!

Have you ever had an idea for a horror film and then it has been made years later???
I know I have !!!!!!! 😱 😈

I think this thread has been done before.

I had an idea of a war: werewolves, vampires, mummies, etc. vs. zombies. During this, a werewolf guy and vampire chick fell in love with each other. Months later, Underworld came out.

Yes, only two out of my ideas have been made by someone else though.