(n.) A bomb.

aerial bomb antipersonnel bomb astonishment blockbuster blow bomb carcass catch concussion grenade depth bomb depth charge earthshaker eye-opener fire bomb gas grenade grenade hand grenade incendiary bomb incendiary grenade infernal machine joker kicker peripeteia petard revelation shock shocker staggerer startler surprisal surprise surprise ending surprise package surprise party switch tear-gas grenade thunderbolt thunderclap time bomb wall grenade