Balloons?? Try 55 gallon yard & garden trash bags like we were doing in High School right after the Metal Shop teacher showed us the dangers of O/A with a little balloon. Prolly did 20 of them over a period of a couple of weeks. Local Police Dept was getting pissed at all of these mysterious large explosions in a residential neighborhood. Final straw was 2 friends using a rose bud to fill the trash bag. As the bag rapidly filled, a static charge left them with blown ear drums and no eye brows or hair on their foreheads! Holding the bag so to speak.