that happened to me once here in a pool in Dubai. Fortunately (or unfortunately for the guy) he was only about NINE YEARS OLD, but old enough however, to stare at me under water using his mask.. he was even trying to stay ahead of me to see me from the front...
I swam close to him, pushed his head under the water for about 3 seconds, then brought him to the surface, and shouted in his face.
WHAT ARE YOU LOOKING AT???? WHAT DO YOU WANT? WHO IS YOUR MOTHER AND WHERE IS SHE???
HAVE SOME RESPECT... OK???
*sorry* he said, very meekly.
He played quietly in the corner of the pool for the rest of the day
Don't mess with the "Sander"...