No man is unbeatable

Other than a disqualification in January '06 for an illegal kick against Yushin Okami, the last time Anderson Silva lost a fight was on New Year's Eve 2004 at a PRIDE bout against Ryo Chonan. How that loss came about must be seen to be believed:

Note to UFC middleweights: Start working on your scissorlock-takedown heelhook-submissions immediately.