spark like how? i've seen a muffler sound like "pongg2" which its not a flame, its more like small xplosion at the muffler tip.. c it at toyota celica mechanical version (which come in 1.8 vvti if not mistaken) while following it..

that 1 is rev cut but not the convention rev cut by stopping the injector but rather shutting off the ingnition
normally this is done to race car by using stand alone ecu
the fuel continue pump by moving piston and flood the exhaust system and later the ignition restart and burn all the unburnt fuel result in a small explosive like u said lo
the logic is the unburnt fuel generraly cooled the combustion chamber for the moment 

or the second way is my way
this apply to carb engine and manual only

first get to speed then press ur clutch the switch off ur engine not to lock but to acc to kill the ignition
later when the ignition system is off release the clutch to make the engine run to pump and flood fuel inside the whole exhaust system
then switch on and will hear a pap sound 

3rd way is just lousy maintain engine and misfire accured
nuff said