WATCH: Luis Suarez may regret accepting this handshake from Filipe Luis

Whatever your issues with Luis Suarez, he surely didn't deserve this school-yard prank.

Atletico Madrid fell to a 2-1 loss in the Champions League quarter final with Barcelona, last night, but will go into the second leg with hope. Atleti claimed an early away goal and fought gamely after being reduced to 10 men, on 36 minutes. Filipe Luis claimed, post match, that the referee had let Barca away with far too much while cracking down on his own side. What the ref, and the five other officials in the vicinity of the action, all missed was Luis' act of unsportsmanlike action. The Brazilian spotted Suarez coming his way and emptied the contents of his nose into his hands. He then offered his hand to the Uruguayan to shake. The deed was done and the game moved on. Luis suggested a conspiracy theory that Barcelona were always going to get a fair shake of the stick. "They are a very big size... It would be very dangerous if they were to go out." https://youtu.be/vSMz0EEgVNU