A man dressed all in white wearing a white mask on his face pretending to be a statue in a plaza .
It is certain that the man pretending to be a statue is playing a prank on his brother .
It is impossible that the man pretending to be a statue is playing a prank on his brother .
It is certain that the man pretending to be a statue is playing a prank on his brother .
The man pretending to be a statue is playing a prank on his brother .