Football has its fair share of controversy with every refereeing decision discussed for hours and the debate on goal line technology raging on.
But there was a time when the rules were even more hotly disputed, back in 1863 when the first official laws of the game were laid down.
They included rewarding players who caught the ball with both hands with a free kick, allowing the goal keeper to bounce it from his box all the way to the half way line and playing with a pigs bladder instead of a ball.
So it's fair to say the rules have come a long way since then. Find out how they've changed through the years with Match of the Day Kickabout's guide to the original rules of football.
Check out MOTD Kickabout every Saturday at 0740 on the CBBC Channel and 1140 on CBBC on BBC Two.