This one's a good example of the power of the internet.
Many years ago I saw an otherwise forgettable American TV movie. It wasn't a horror or suspense flick - just a drama about a family based murder. But there was one scene I never forgot.
Aside from that one scene, I could never remember anything about the movie, its name or any of the actors, so I have never been able to find out what it was called. I couldn't even remember much about the plot except for this one scene.
I googled some key aspects of the scene and incredibly, the FIRST hit was a forum discussing it. Not only that, there was a link to that very scene on youtube.
The background is that a husband is suspected of murdering his wife and he has shot through. The cops were convinced he had killed her in the living room so they sprayed this stuff all over the house that would glow in the dark if there were traces of blood on anything. While all this is going on, the guy's parents turn up to look after the children. For the sake of convenience, they decide to spend the night in the house ....
https://www.youtube.com/watch?v=uhBm08WEgS8