Most Instructables about potato cannons involve building big, heavy-duty, cannons which are a little dangerous. This instructable is about building a small potato cannon that you can shoot in your back yard or basement.
It is 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. Do not use gas or other explosives. Other than that you should be good!