The jack-in-the-box effect is a specific effect of a catastrophic kill on a tank or other turreted armored vehicle in which an ammunition explosion causes the tank's turret to be violently blown off the chassis and into the air. It is named after the child's toy, the jack-in-the-box, in which a puppet pops up. Most of the time the crew inside does not survive.
If an anti-tank projectile or shaped-charge blast manages to penetrate a turreted armored vehicle's hull and subsequently its ammunition storage area, the shock wave or heat and pressure can be sufficient to cause cooking off or sympathetic detonation of some or all of the tank's unfired explosive shells and propellant. This causes a massive and instantaneous overpressure in the sealed internal compartment of the tank, until it explodes outwards through the weakest point in the otherwise homogeneous compartment, namely the turret ring, blowing the turret completely off the chassis and into the air in a gush of flame.
The jack-in-the-box effect is known to occur in tanks which are "buttoned up" (i.e. with all hatches closed and locked), and which have internally stored ammunition and no blow-off panels on the ammunition storage area. Tanks of the World War II era were frequently seen to have lost their turrets in this manner, largely owing to the design of that era, as at the time it wasn't recognized that there was a need for special shielding of the tank's ammunition storage compartments. Some modern tanks such as the Russian T-72, T-80, and T-90, feature a compact three-crew design with an auto-loading mechanism, eliminated the need for a fourth crew member who is the loader. While this gives the tank a lower profile so it can better avoid getting hit by enemy tanks, the tradeoff is being extremely vulnerable once hit (even an indirect hit) which will likely set off the ammunition stored in a ring along the inside of the turret right next to the crew. The newest Russian tanks are still susceptible to this effect, even with composite armour and Reactive armour, as they retain the compact three-crew cabin.
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