When it comes to street fights, Chuck Liddell has one important piece of advice for BJ Penn -- "It really isn't worth it at this point in our lives."
Liddell and Penn came up around the same time and are both members of the UFC Hall of Fame -- and both had a reputation for fighting ANY opponent, any time, any place.
But, after 40-year-old Penn got knocked out in a street fight in Hawaii this week, Liddell says Penn should probably take some time to think about his decisions.