I lived through the dot com era. It was a wild ride up, buying all the IPO's on the day they went public, no matter what price they opened up at, and still doubled or tripled my money in a day or two. Anytime the market dipped, it was a signal to buy, until the dips continued and continued. Before you could (or should have) realize the market was crashing, profits disintegrated and the losses mounted (was buying on lots of margin). One prime example was Juniper, bought 200 shares on the first day it traded (total cost 19k). It ran, split, ran again, split again. My 200 shares became either 800 or 1600, I forget, and my 19k ran to 300k, in less than 6 months. Talking heads were calling for NASDAQ to 10,000 (it wasn't 3000 at that time) and the DOW to 50,000 (it was nowhere near that number). Prudence gave in to greed and pigs (myself included) were slaughtered. People much smarter and more market savvy than me lost millions. The only consolation, and it was a valid consolation, was that I went through a divorce not long after and there was less for her to claim!!