It's a superstition/belief some people have. No one knows for sure if it's right
The cast of Til 3 Knocks - 2008 includes: Paige Beechey as Emma Michelle Sowden as The Woman
Opportunity Knocks - 2008 The Laut Family 1-3 was released on: USA: 30 September 2008
String Theory - 2011 Opportunity Knocks 1-3 was released on: USA: 25 March 2012
Valerie - 1986 School of Hard Knocks 3-8 was released on: USA: 16 November 1987
Hard Knocks - 2001 Training Camp with the Miami Dolphins 3 7-3 was released on: USA: 21 August 2012
Balls - 2010 Inside HBO's Hard Knocks 1-3 was released on: USA: 21 August 2010
Vampirism Bites - 2010 Fool of Hard Knocks 3-2 was released on: USA: 12 September 2012
Hard Knocks Training Camp with the Dallas Cowboys - 2008 1-3 was released on: USA: 20 August 2008
Hard Knocks Training Camp with the Cincinnati Bengals - 2009 1-3 was released on: USA: 26 August 2009
I replaced a 1995 town car intake it also knocks now. Not sure. I'll post later when I find out why.
i heard there is a second part to that video. the fights real and i also heard on youtube that theres more to that video and that he knocks them both out
Hard Knocks Training Camp with the Dallas Cowboys - 2002 was released on: USA: 3 August 2002