I have but probably broke even after a year. I would play manipulated penny stocks. Get tips daily via text, pump and dump style. Put in and pull out before the bottom falls out. Some I would ride throughout the day and use multiple sites, trademonster, ameritrade and so on. I was flagged as a day trader on all but I just had to keep a minimum in my trading account.
I of course have long stocks and invest pretty aggressive but I had some free time at work an took advantage for a while to day trade. I dont have the nerves anymore, try throwing in 1,000 here and there a day on multiple stocks and seeing it disappear in seconds but then again, I bought in and made 1,000's in seconds. Its a hell of a ride.