Magnificent and instant classic!
A while back, we had this sort of thing happen ... back in 2007 or so when we were on a roll with playing the 2nd edition of Villains and Vigilantes
. The group had three of us who were old school gamers and about three newer ones. The bad guy, Nightmare, was on a rampage and our heroes, The Titans, were supposed to take him down. We had the whole group get set to shoot all of their energy powers at the guy through some sort of device the brains of the group came up with. Since I was GM, I made the decision that one person could make the hit roll ... and the villain did as this lad above do; gave them the chance to surrender. With a colorful explicative from the group, the button was pushed and the shot was fired for a critical hit! The smoke clears and Nightmare was still standing ...
You could have dropped a pin on the floor and made a sound not unlike taking a final in the Physics class and accidentally dropping the text book on the floor.