Played penny games online for a bit and free rolled my way to a $10,000 payday once. My game really took off from there and wound up making a ton of money playing 4/8$ triple draw lowball and 5/10 limit holdem.
The site I was on was pretty small and one day I waited for a couple hours for a game. Thought I'd try my luck at 25/50 triple draw because there were a few players at the table. These guys cleaned up my bankroll in about 30 min. Using all the same moves I'd use at my normal limits. I was more concerned about the money than making optimal plays. It was a real life lesson for me. I stopped playing for a year or so and have only played casual since.
The money was to big for me to properly focus