If you had $25k and needed $100k

[Sully]

A hypothetical question, although for a while, I was afraid it was real, so I had to put some serious thought into it....here's the scenario:

My brother was in a major car accident. He was 23, and had no insurance. My parents were able to contribute, but we were still about $100k short of what we needed to give him the proper care to save his life. I had $25k, and about three days to figure out a way to turn it into $100k. We really had no other options.

If you had to take a shot like this, what would you do? Please forget for a moment that there are other options besides Vegas (we obviously figured out a way). I had to think about this a lot, and it still intrigues me from time to time.

What casino game to you try...do you just go big early, or try to build? I leaned towards blackjack, as I know the game well...to the point of having learned to count cards, etc. My problem is that I am not a great card counter, and I'm not going for the long run here. This is all short term...high risk of ruin.

What is the best approach?