victory against celta vigo on sunday evening featured one of the most bizarre incidents of the season so far .
with the score at 1-0 following jeremy mathieu 's 73rd minute header , tempers flared between celta striker fabian orellana and sergio busquets as the barcelona midfielder attempted to waste time during the closing stages of the match .
orellana was shown a red card for throwing the chunk of grass in the direction of busquets .