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If possible, I'd make the following prop bet with someone (who wasn't my friend):

We'll flip a coin and I pay you 2:1 on the flips, you start with $10 I start with $1,000,000, the first flip is for $10 and we play double or nothing every time until one of us is out of cash.

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I'll take that. Or, at least, I would take that if you really had a million dollars you'd pay me. I'd only need to win 10 flips in a row to win $600,000, or 11 to win $1,800,000. That's only 1 in 1024 or 2048. In other words, my $10 investment has an EV of +$870.

As a side note, this is why the Martingale system doesn't work. It really doesn't take that long of a streak to get to a huge number.