LONDON, England (CNN) -- Norwegian referee Tom Henning Ovrebo is at the center of furious debate as to whether his decisions denied Chelsea their place in the Champions League final.
Germany's Harald Schumacher was not punished for this leaping challenge on France's Patrick Battiston.
He incurred the wrath of Chelsea players and fans who believe he waved away at least four penalty decisions that would have signaled victory for the team.
Didier Drogba approached Ovrebo after the match and swore into television cameras, while manager Guus Hiddink and captain John Terry have also voiced their anger at the refereeing calls.
Barcelona were also aggrieved when Eric Abidal was sent off.
The furor surrounding Ovrebo is not the first time -- and will certainly not be the last -- a referee has found himself or herself in the firing line from irate players and fans.
Below is a look at some of the controversial refereeing decisions of all time.
World's worst refereeing calls:
1. France v Germany 1982
It is hard to think of a worse foul that has gone unpunished than that which saw French striker Patrick Battiston be stretchered off unconscious and with a broken jaw during a World Cup semi-final. Battiston had been played into the clear with just German keeper Harald Schumacher to beat. Schumacher launched himself into the air and went past the ball, crashing his hip into Battiston's head -- seriously injuring him. Battiston was carried off and spent months recovering, while Schumacher continued on and was awarded the goal-kick.
2. Argentina v England 1986
While the foul on Battiston was horrific, the "Hand of God" still remains as one of the game's most infamous moments. During a World Cup quarter-final between the sides, Diego Maradona leapt high into the air to compete for the ball with England goal-keeper Peter Shilton. From the contest Maradona raised his arm and managed to fist the ball into the back of the net -- helping his side to a 2-1 win over England. They went on to win the World Cup.
3. Brazil v Sweden 1978
Welsh referee Clive Thomas fell out of favor with Brazilian fans when, in a group match, Brazil's Zico headed a goal from a corner late in the match -- only to find that Thomas had already blown the full-time whistle. The goal would have been a winner for the Brazilians, but instead the match ended 1-1.
4. Croatia v Australia 2006
In one of the most high-profile gaffes by a referee in modern football, English referee Graham Poll gave Croatian player Josip Simunic three yellow cards before finally sending him off during the World Cup match. The match ended a 2-2 draw -- enough to send Australia through to the knockout stages. Poll subsequently retired from refereeing international finals matches, citing the error as his reason.
5. Cameroon v Nigeria 2000
Tunisian referee Mourad Daami's decision to disallow a legitimate penalty for Nigeria during the shootout of the African Nations Cup final may not have been the worst error ever seen -- but it certainly had serious results. After Victor Ikpeba's penalty had clearly crossed the line after hitting the crossbar, Daami ruled it hadn't and Cameroon won the shootout 4-3 and took the title. The decision sparked anger and unrest among the home Nigerian crowd after the game.
6. England v Germany 1966
It has never been proven, but the German players and fans have long insisted that Geoff Hurst's first extra-time goal of the World Cup final never crossed the line. Regardless of what the truth is, the goal was awarded and Hurst went on to score another, giving England the World Cup crown.
7. South Korea v Spain & South Korea v Italy 2002
Both Spain and Italy were victims of harsh decisions in their World Cup matches against the joint host South Korea. Spain had two goals disallowed in their game. The Guus Hiddink-coached Koreans eventually made it through to the semi-final of the tournament -- so the Chelsea manager can't claim to always be on the wrong end of tight decisions.
8. England v Portugal 2004
This quarter-final of the 2004 European Championships looked to be going the way of England when Sol Campbell scored a last minute winner -- only for it to be ruled out by Swiss referee Urs Meier, who instead penalized John Terry for allegedly fouling the Portuguese keeper. England lost the game on penalties and Meier was bombarded with hate mail.
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