50-50-90 rule

Anytime you have a 50-50 chance of getting something right, there's a 90% probability you'll get it wrong.

When flipping a coin, take into account the 50-50-90 rule,most likely you'll be wrong.

50-50-90 rule by SonicWolf January 18, 2009

The 50-50-90 Rule 

Anytime you have a 50-50 chance of getting something right,there's a 90% probability you'll get it wrong.

Person 1: Did you hear about Teddy ?
Person 2: Yeah, he was screwed over by the 50-50-90 rule while trying to argue with his girlfriend.

The 50-50-90 Rule by Bubble Juice September 12, 2009