I remember when creating RNG's in school, I set up a simple button that populated a text box with "pass" or "fail". Anywho, I set the values at pass 90% / fail 10%, and I got 'fail' five times in a row. Then I increased 'pass' to 95% and still got fail two more times. Insane. The teacher came to me and jokingly said, "I guess you're just not meant to pass this course."

Sometimes RNGesus is good. Sometimes... not so much.