Does a horror movie exist that under no circumstances you would watch alone & have you ever came close to doing so but had to switch off?

Ever since I was a kid horror movies have scared the bejeezus outta me.Doesn’t stop me coming back for more.As long as it’s well made & genuinely frightening then i’m good to go.On one condition,there are a few that if I watch alone I pretty much know i’m going to wimp out.Is there an example where you feel the same?