Yes - it is serious. I know myself because I was hooked on Percoset. I was taking four of them an hour and washing them down with a beer. That went on for a month. All I did was lay on the couch, watch TV and take pills & drink beer. At some point in that month, the kidney stone passed, but, the pills and beer continued.
One day I walked into the bathroom and flushed probably 300 pills down the toilet. The next 72 hours, as my body flushed out all the poison & every muscle in my body screamed out as the again started to work - was pure hell.
Also, an addition to acetaminophen eventually destroyed my daughter's liver & she died about 10 years ago from liver failure. She had been taking Tylenol for her migraines and - just overdid it.
Given the choice between narcotics and Tylenol, I would be hard-pressed to say which is worse - probably the Tylenol since the damage it causes can be so severe & in such a short time it can go unnoticed and ironicly, the symptoms and damage of an overdose probably make you take yet more of it.
Anyhow - my initial post was made in jest & the OP took it that way. I'm a firm believer that laughter is the best medicine.