that made you laugh in all the wrong places, along with the rest of the audience?

For me it was Pet Sematary. I noticed everyone snickering during the first half hour. Then when "Herman Munster" (Fred Gwynne) says "The ground's sour.", the entire theatre lost it. People were laughing so hard they were crying.

2nd runner up would be Child's Play. So many people were saying "How ridiculous" "Step on the doll" and then heavy laughter.

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Just be yourself. The rest will fall in line.