Tylenol/paracetamol/acetominophen
An overdose of Tylenol has a probability of ~5% or less of killing you. That is an incredibly low chance. If you succeed, odds are it will be slowly over the course of days to weeks, or even months, as your liver slowly shuts down. This would be an excruciatingly painful death. Liver failure causes your skin to turn yellow, nausea, vomiting, severe abdominal pain, fowl smelling pale stools, and even the potential for massive esophageal bleeding. More than likely, however, you will throw up for several hours before returning back to baseline over the next few days. If you do seek medical care, you will be given the reversal drug and then sent to the psych ward after being medically stabilized.