Every year, a family home is turned into a haunted house. The purpose is not only to be as terrifying as possible, but also to create a spectacular attraction to draw the neighbours in. In response to some criticism, the father commits irreparable damage.

总被班上同学戏称为小妞的青涩男孩麦考柏，与名字老被人联想成汽油的转学生瓦斯林，老被排挤的哥俩好为自己的苦闷找到出口，突发奇想计划一场疯狂冒险。随着暑假来临，两个小鬼头一点都不想和家人共度无聊的夏天。一台割草机引擎与几片木板，他们以“土法炼钢”的创意打造自己专属的“动力房车”，踏上横跨法国城镇的公路旅行。