It is extremely unlikely you will get injured by this but dont be stupid!! The ignitor can give you a shock that is pretty painful but only has the power of a AA battery. dont use any other fuel other then hairspray or deodorant dont use gas or something stupid like that. other then that were all good!
Step 1: Supplies
2 corkboard push pins
1 used disposable camera. (you can also get these free from any store that develops film.)
1 bic pen
some insulated wire
electrical or duct tape
scissors or a knife
Step 2: Ignitor
Step 3: Cannon
Step 4: Put it all togethor
stick the push pins diagnol in the canistor so they are almost touching. now grab some oust, axe, or hairspray, strawberries or a potato and lets head outside. stab the front of the barrel into the strawberry or potato and get a piece a litte less then 1/2 inch inside the barrel. push it down to the bottom of the barrel with a nail.
spray the oust in the canistor for 1 second let it air out for about five seconds then put the back on. press the button on the ignitor wait for the whining sound to stop hold the back on firmly and wiggle the pins until they touch inside the canistor there will be a spark inside and the potato will come flying out.
Note after every fire take the battery our of the ignitor and take the back off wiggle until they touch there will be another big spark then it is safe to reload.
you may have to change the pins every once an a while because the spark welds them away.
do not touch the pins after firing as they are usually hot.