Last night's hand at the casino caused some controversy, alteast on my part. I'd like to hear your opinion on the matter.

We wind up on the river. Pot is around 1k €. I am OOP and I check and villain just turns his cards face up and shoves them over the line. He didn't announce a check and I protest that his cards are therefore dead.

Different casinos, different house rules. However what would you say is the "general" rule to go by.

Thanks and best regards