What is the secret formula for scaring someone [No cheap scares!]

[Cranky Old Man]

The most effective are horror parts in non-horror games. As a 14 year-old, I was not prepared for Ravenholm way back when. Good 'ol HL2. :]

I think they actually released Ravenholm before they even released HL2. It won an award for best zombie level in a game, or something. You did a good job staying away from spoilers, I guess.