+1 on being extra careful. I can think of several 'oh %$#@!" moments when playing with fireworks. Biggest was over 10 years ago sitting on back porch at my brother-in-laws house launching mortars. Well, my other brother-in-law is smoking and caught the entire box of mortar shells on fire somehow. The entire back porch explodes with all of us there including one of my kids then around 4 years old. Luckily they were not the bigger size mortars so nobody got hurt but don't think my boy liked fireworks that much after that lol.