Shrödinger's Day-Trader

Set up a machine that will kill you unless you get what you want. Set it up so that the probability of the machine malfunctioning is massively less than the probability of you actually getting what you want by chance. Then, activate the machine. In the universe you subsequently experience, you have what you want!

The many-worlds interpretation of quantum physics suggests that in the Shrödinger's Cat experiment, there are some future universes in which the cat lives and others in which the cat dies. If you (an observer, I presume) sat in the box instead of / with the cat, you could only observe outcomes in which you survive. With some minor changes, this suggests a way to get any outcome you want relatively quickly.

There are many variations on this: the randomizer could be the stock market, the lottery, etc. The lethal mechanism could be many disturbing things, such as a computer program to recommend you eat either some toxic sushi or some non-poisonous sushi, which you have placed in a revolving randomizing mechanism after telling the computer which is which (multiple levels of error- checking and backup systems would help ensure reliability, otherwise the least-unlikely survival scenario is that you screw up the lethal contraption and end up losing all your money and also eating the non-lethal sushi). You must remain the observer for this to work. (If you see someone else try this, or hire someone else to do this for you, they will have a much lower success rate, since you can observe outcomes in which they die.)

Once could argue that life is an example of this: each one of us will die unless we get rich enough to buy immortality. I find this thought reassuring, given my desire for both wealth and immortality.