This is probably the most famous mistake in World Cup history.
Tofik Bakhramov was the infamous "Russian" linesman of the 1966 World Cup final.
Bakhramov was in fact from Azerbaijan and their national stadium was recently named after him.
After 11 minutes of extra time, Geoff Hurst had a shot that hit the crossbar. It bounced down before bouncing away from the goal.
The question of whether the ball went in or not still rages today. Modern technology suggests the ball didn't cross the line and therefore wasn't a goal.
Rumor says that on his death bed, Bakhramov was asked why he gave it as a goal. He is said to have replied "Stalingrad."
However, in his memoirs he stated that he thought the ball had bounced back off the net.
Bakhramov's mistake put England 3-2 ahead of the West German's, giving England a helping hand on the way to World Cup glory.