Cristiano Ronaldo was visibly upset with Athletic Bilbao's Javi Martinez following Madrid's 3-0 win on Wednesday.
And now we know why.
"Basically I told [Ronaldo] to stop pointing at the stands. I might have called him a 'son of a b***h', but players refer to my mother every game and nothing ever happens," Martinez told Spanish newspaper Onda Cero (h/t Goal.com).
Instead of nothing happening, Ronaldo had to be restrained while making this universally-recognized gesture to the Bilbao player.
Madrid secured their 32nd La Liga title—their first since the 2007-08 season—in a game where Bilbao had plenty of the ball, but Jose Mourinho's men created the best chances.
Ronaldo's night got off to a slow start when he badly missed a penalty kick early in the first half.
But the Portuguese attacker recovered well, assisting on Madrid's second goal and scoring their third himself by heading home from close range in the 50th minute.
For his part, Martinez had something of a nightmare.
In the 11th minute, he handled the ball in the area to concede the penalty kick Ronaldo was kind enough to miss. Then, he was dismissed in the 72nd minute after receiving another yellow card for a second hand ball.
Martinez says the incident with Ronaldo will be quickly forgotten.
"Sometimes you're a bit hot-headed and you say things you later regret," he said. "We will just shake hands when we meet again next year, and nothing will come of it."
Martinez still has plenty left to play for this season.
Athletic Bilbao will contest the Europa League final against Atletico Madrid on May 9th.
Then, the Basques will face the Catalans in the capital as Bilbao and Barcelona travel to the Vicente Calderon for the Copa del Rey final on May 25th.