I had three withdrawal seizures, two of which put me in the hospital. Those things are brutal, it feels like you've been run over by a 2-ton truck afterwards. I could barely walk for a week after one of them, and nearly bit my tongue off during another. I was also completely uninformed and had no idea that stopping drinking would lead to a seizure. Finally, I have heard that once you have the first one, it 'opens a door' and subsequent seizures become more likely if you continue the behavior.
My final seizure convinced me to quit for good and seek treatment, there's no way I could ever handle another one of those bad boys.