Statistics
When text for the first year of an MBA is "How to Lie With Statistics", who in their right mind would ever believe them.
Given any set of raw data, and manipulating them with allowable, legal statistical analysis, you can get diametrically opposite answers.
As has been quoted, "There are 3 great untruths, Lies, Damned Lies and Statistics ".
When you resort to quoting numbers, you've lost, give up!