Boom

Shhh! Bomb expert at work:

A hand grenade exploded inside courtroom in Karachi’s Anti-Terrorism Court (ATC) after a judge asked a police constable if he knew how grenades worked. The constable, instead of explaining his expertise in weapons and grenade handling to the judge, opted to demonstrate practically by promptly pulling out the pin from the grenade.

This resulted in a loud explosion, injuring three including the constable and a court clerk.

We'll take that as a "yes." Whether or not he knows when to use a grenade is another matter.