A high capacity Nicad battery can easily source 200 Amps when shorted. Some of the really high capacity cells used in giant scale models can source as much as 350 Amps. Most automobile batteries can not match that. Fortunately, the fusing current of the wiring to the pack falls far short of these currents, so it should fail before a fire gets going. However in the very short term, molten copper in your pocket will provide plenty of dancing with commentary.