What is sport's dirtiest act?

What is the dirtiest act in sport?

Luis Suarez joined the likes of Iron Mike Tyson, Brad Morrin and James Graham when he sunk his teeth into Chelsea's Branislav Ivanovic. It wasn't the first time Suarez had taken a chomp out of the opposition, his Ajax career ending in shame when he bit an opponent in 2011.

Jerome Fillol gave a whole new meaning to giving the opposition a spray when he spat in the face of an opponent during a rugby union match in England earlier this month. For his troubles, the Frenchman was handed a 14-week ban.

Former football enforcer Vinnie Jones famously did it to England star Paul Gascoigne in 1988 and a Kenyan referee suffered the same fate this year, when his testicles were attacked during a pitch invasion. Sydney FC star Joel Griffiths also dealt a low blow of his own when at Newcastle Jets, slapping the groin of a linesman in frustration.

Pretty self-explanatory here. Former NRL bad boy John Hopoate is most famous for inserting his fingers into opponents' backsides in a bid to unsettle them. It might have had the desired effect, but it also cost Hopoate a 12-match suspension.

Former Melbourne Storm forward Danny Williams received an 18-week ban, the second- longest in rugby league history, when he knocked out unsuspecting Tigers forward Mark O'Neill in 2004. Another notable incident was 'Big Bad' Barry Hall flooring Eagle Brent Staker in an off-the-ball incident in a 2008 AFL clash.

French legend Zinedine Zidane's career ended in shame when he was sent off in the 2006 FIFA World Cup final for a headbutt on Italy's Marco Materazzi. Just this season Everton cult figure Marouane Fellaini copped a three-match suspension of his own for headbutting Stoke's Ryan Shawcross.

Occasionally seen in the rucks of rugby union, eye-gouging carries hefty bans for players found guilty. French centre Aurélien Rougerie escaped a ban in the 2011 World Cup final for an attack on the eyes of Richie McCaw, while Springbok Bakkies Botha wasn't so lucky in 2003. Botha was found guilty of eye-gouging Wallabies hooker Brendan Cannon and banned for eight matches.

What's worse than an attack on an opponent? One on your own teammate of course. Red Bull's Sebastian Vettel did just that at this year's F1 Malaysian Grand Prix when he defied team orders to steal victory from Aussie Mark Webber.