Three pupils host a party. As the night progresses, things get out of control.

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Three teens decide to host a birthday part that will make them legends at their high school. The birthday boy is afraid his parents house could get damaged because they're out of town, but his buddies persuade him nothing bad will happen. But once the party is promoted on the internet and the radio, thousands show up, the house begins to be destroyed, someone brings a flamethrowers and the police are called to calm the situation.

Project X has no worthwhile plot, it's more like a documentary that's out of control. The moral of the story doesn't take the high road, as the kids ruin their parents' lives but do become popular at school. This makes the ending not fit the rest of the movie, which seems to illustrate the dangers of Facebook parties where hundreds or thousands show up uninvited.