I am going to make a real life horror aventure with friends! need help for scares!

[WatzUpzPeepz]

You could play some monster noises or scary noises,also use fishing line,tie it to...lets say a cheap vase that u could buy for $1 so when your target walks into the fishing line it will tug the vase of a nearby table and cause a crashing noise.
Oh and yes what the guy above me said,make sure they arent armed. XD