Uruguay brought 86 pounds of dulce de leche - a popular caramel spread in Latin America - to Brazil, but unfortunately it contains milk and they did not have the proper documentation. So, officials confiscated it at the Confins airport near their training base of Sete Lagoas. Whoops.
Here is the best detail of the story, from BBC Sport:
It is not clear if one person carried the entire 39kg-stash or if the jars of the popular sweet paste had been distributed between the players.
Uruguay was upset by Costa Rica in their World Cup opener, so the thinking is the lack of dulce de leche could have thrown them off their game. They brought it to South Africa in 2010 without any paperwork. But don't worry, those jars will not go to waste.
An official told Reuters that the spread can be freed "as soon as they can produce the necessary documents...or they can pick it up on their way out of Brazil."