An estimated 500 people end up in the hospital with CO poisoning every year. Not everyone has the financial resources to prevent a CO risk at home and that’s why it’s so important to recognize the symptoms, it might save your life. Headache, fatigue, nausea and dizziness can be signs of CO poisoning. We highlighted these symptoms in three mini horror films with an unexpected plot twist. For once, it is not the strange in-laws, a possessed child or an 'evil' cat who’s out to get you. It’s your boiler or stove.