Fred, whom you've known for years, suddenly tugs at your sleeve. It's Charlie, me mate, he's real sick. It's the plonk. As you arrive, Charlie lets out a loud cry and starts to shake violently from head to toe, knocking over his sherry.
Epilepsy is common amongst alcoholics.
A reaction to some other serious problem such as an overdose, stroke, head injury or heart attack. Note the time of the fit. It's all right, Charlie. You're right, mate. Loosen any tight clothing around the neck.