Ah-Ahli fans launched missiles at Cristiano Ronaldo and his Al-Nassr team-mates while chanting 'Messi' during a Saudi Pro League match.
Otavio fell to the floor when one plastic water bottle exploded on his head.
Ronaldo and his pals were celebrating after he had seemingly put them 1-0 in front, though his goal was ruled out for offside.
He would later convert a penalty to win the Friday game 1-0, with Sadio Mane and Roberto Firmino reuniting afterwards.
Those good feelings were marred by the Ah-Ahli delinquents, who pelted the opposition players with multiple objects.
Ronaldo is used to the 'Messi, Messi' chants by now, and so is his Argentine counterpart.
Messi was forced to hear the name of his rival during Inter Miami's 3-1 win over Nashville in the last 16 of the CONCACAF Champions Cup on Thursday.
He responded in perfect fashion by scoring within 14 seconds of the chants starting, silencing the crowd.
And Ronaldo had the last laugh when he scored the only goal in Al-Nassr's 1-0 win over Ah-Ahli, seeing his side move nine points clear to cement their place insecond position.
After scoring his penalty, he and his team-mates got playful, doing tricks with new water bottles when they were launched and inviting more.
Ronaldo is the top scorer in the Saudi Pro League this campaign having scored 23 goals for Al-Nassr in the league.
That said, they are nine points off unbeaten league leader Al-Hilal, so their title chance are diminishing.
They are also out of the Asian Champions League, having lost to Al-Ain on penalties in the quarter-finals.
That match descended into anarchy at full-time, with a scuffle breaking out between players.
Mane even grabbed a player by the throat during the match but escaped punishment.
Noman05
520
Saudi Arabian people's are getting worse as days goes 😔
FootballBible
432
Cristiano is the only GOAT that can change the face of a nation and still be hated but still feel good to play for that nation.
jauabikrs
248
That's why Josi rightly said about CR7 that if someone is hating CR7 that means he has destroyed your club...