Uh... They aren't quite as safe as you're implying. Hydrogen is really easy to light, and if one balloon goes the others in the bunch will 100% ignite too. You

Uh... They aren't quite as safe as you're implying. Hydrogen is really easy to light, and if one balloon goes the others in the bunch will 100% ignite too. You still get a pretty good amount of fire per balloon, just not an explosion.