The theory is that beer contains female hormones (hormones contain phytoestrogens) and that by drinking enough beer, men turn into women.
To test the theory, 100 men drank 8 pints of beer each within a 1-hour period. It was then observed that 100% of the test subjects:
Argued over nothing.
Refused to apologize when obviously wrong.
Became overly emotional.
Failed to think rationally.
Had to sit down while urinating.
No further testing was considered necessary