One of the great moments of Barcelona's 4-0 win over Osasuna came when Lionel Messi dedicated his goal to Diego Maradona, who passed away this week.
Messi peeled off his Barça shirt to reveal a Newell's Old Boy shirt -- the one wore by Maradona when he played for the Rosario club briefly -- and pointed to the sky.
The celebration forced referee Mateu Lahoz to book the Barça forward for removing his shirt, in line with the Royal Spanish Football Federation's lawbook.
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In addition to the booking, the caution for the celebration comes with a €3,000 fine. It's not a rule which is exclusive to the Spanish league and is also applied by FIFA.