Some Silicon Valley techies have turned to regularly meeting for a vicious real-life, underground fight club.

They beat each other relentlessly in a garage using household items.

Shiyin Siou, 34, a Santa Clara software engineer and three-year veteran of the clandestine fights told the Associated Press, "When you get beat down enough, it becomes a very un-macho thing. But I don't need this to prove I'm macho -- I'm macho enough as it is."

Taking inspiration from the 1999 film "Fight Club," starring Brad Pitt and Ed Norton, secret bare-knuckle brawling clubs have sprouted up as a way for disgruntled men to release their frustrations.