For me is just under $25K. Won it in a Masters bet where I picked a combination of a bunch of golfers to finish in different places in the top 20. It was one of those stupid $50 bets with next to no chance. I did two combo's and one of them hit. Other than that I have had a few $2K nights playing cards or whatever, but that was by far my biggest win.
I thought of it today, as I just had a $20 cash in turn into a $500 cash out in hour online black to kill time.