title: How to make a JavaScript function that usually returns true, but returns false randomly, once every 50 times on average?
body: <p>I'd like to make a function that returns <code>true</code> most of the time when it's called but that will return <code>false</code> occasionally?</p>
  
  <p>By occasionally I mean, at 1000 calls, it'll have an average of one <code>false</code> every 50 calls.</p>