Hypothetical - Multiplayer Horror

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Provided enough of the party becomes scared, then the group will eventually become frightened and tense. Additionally, groups also have atendency to reinforce commonly shared beliefs and feelings,group think, note that this dynamic also is exacerbated in groups in which members are tense or under pressure (e.g. scared). To draw a simplification of my own: If you make a few people in a group scared - and the rest of thegroup buys it - the fear will propagate through the group, and the group shall be more perceptive towards being scared in future, a kind offeedback loop.

Yes, I think this could definitely work. I've seen it plenty of times in those haunted houses, where you walk through with a small group and get constantly scared by the guys working there. There are always those "tough" people, who just laugh at the scares, but as soon as they are outnumbered by panicking group members, the shared fear often "infects" them and they start to get jumpy, too.