They're actually supposed to be more common in dogs than in cats. Haven't had the heart to get another dog since I had to put my last one down (cancer that grew from golf-ball size to softball size in less than a week). My father-in-law's dog has 'em, so I was at least a little familiar with them, otherwise I might have freaked out.
In case you read this and wonder what to do, the best thing is to get them on the ground and clear the area. At ALL COSTS, avoid sticking anything into their mouths to "keep them from choking on their tongue". The chances of that happening are slim, and you're only inviting trouble, as muscle control isn't happening, and you may end up getting bitten or having them chomp off a chunk of something that DOES do them damage. Let them just go through it. They should last between a few seconds to a few minutes. If they go longer than 5 minutes, you should take your animal and seek emergency attention, as vital organs can become damaged after that much time. If they have more than one in a 24 hour time period, also take them to be checked out. Many times they can be attributed to some bodily function or organ malfunction. That's what I've gleaned from MUCH looking around and talking to 2 different vets OTHER than the one I took him to.
If the pills are necessary, they indeed are claimed to be life saving, but I've since found out they don't like to give them until the seizures become much much more common.
Seems like he's a totally different cat now too. WAY more social than a week ago. He didn't seem to be suffering having the seizures other than he looks like he's trying to crawl right out of his skin....dunno, it looks like it'd mess me up pretty good if it happened to me, but everything/one says it's just a WICKED crossing of wires in there and nerves/muscles firing off at the same time.
If you like animals, it's one of the scarier things that you can witness happening to them.
And anyone who told me I needed to take my ANIMAL to a SHRINK would lose me as a customer. When the animal starts TALKING to tell me they're depressed/upset/whatever is the day I consider it, until then, I'll just care for the animal and give it as much attention/love as I can, and tell the vet to go stuff it.