Quoted from rai:
Ok, I was just checking because some people might have all assets in one stock. There was a famous internet thread I’ll try to post it. But some guys were in on an Apple supplier and they got fabulously rich quickly and lost it all in a matter of days. Some of the posts are heartbreaking to read.
I love Apple stock but I’m almost too into them but almost can’t sell right now because I don’t want to pay massive tax on gains. ( my holding in Apple are not in a tax shelter account).
Good old GTAT. I bought $10k worth of that for a swing when I saw it had gone from $20ish down to $10ish. I don't remember the details, but I sold out either the same day or a day or two later for essentially no gain or loss. It was less than a week later that it dropped 90% overnight. I was stupid to buy it and lucky I didn't still own it.