Oh, Motherwell! Oh no, you didn't!
There are some rules in football you just don't break. While we can argue for days over certain unwritten rules - such as if a player scores against his old club and not celebrating or a short run up on a penalty.
However, there is one rule we can all agree on and that is returning the ball to the opposition after an injury to a player.
In the past teams have not always applied this rule. The most famous example being Arsenal offering Sheffield United a replay in the fifth round of the FA Cup in 1999. After Kanu failed to return the ball to the Sheffield United players and Arsenal scored from the resulting play.
Motherwell were guilty of breaking that unwritten rule today at Celtic Park. Trailing two nil after fifty minutes, Motherwell's Ryan Christie suffered an injury and Celtic put the ball out of play. After receiving treatment, the Motherwell player throws the ball down the line and youngster James Scott, who either didn't know the rule or decided to beat to the march of his own drum, broke away to shoot.
Scott's shot was saved by Celtic keeper Scott Bain, but Ariyibi slotted home the rebound.
Check it out here:
While it is an unwritten rule to return the ball to the opposition after an injury, it is very much seen as poor sportsmanship to not play along with one of football's time honoured traditions. Obviously Celtic were incensed by the decision and there were confrontations across the pitch as a result.
While Celtic seemed slightly rattled by the incident, Motherwell could not take advantage and Celtic ran out eventual winners, scoring two goals late on to secure a 4-1 victory.