Russian roulette is a deadly game of chance involving a revolver loaded with one bullet in a randomly spun cylinder. The player places the muzzle against their head and pulls the trigger, risking a potentially fatal outcome. It is a game of extreme risk with a high probability of death or serious injury. 

How it's played:

1. A revolver is loaded with one cartridge.

2. The cylinder is spun to randomize the bullet's position.

3. The player points the muzzle at their head or body.

4. The trigger is pulled. 

Probability of death or injury:

• With one bullet in a six-chamber revolver, the initial probability of death is 1/6 (or approximately 16.7%).

• If the cylinder is re-spun after each pull, the probability remains constant.

• If the cylinder is not re-spun, the probability of death increases with each pull of the trigger, eventually reaching 100%. 

Beyond the game:

The term "Russian roulette" is also used metaphorically to describe any risky or reckless activity with potentially disastrous consequences. For example, gambling, making reckless business decisions, or driving under the influence can be described as playing Russian roulette, according to Dictionary.com. 

This video shows how Russian Roulette is played in real life:

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YouTube · Dec 5, 2016