Dropping water balloons from buildings can be injurious to any unfortunate people below. My solution is to create soap bubbles filled with a mix of smoke and sulphur hexafluoride. Being 5 - 6 times heavier than air they would fall at a reasonable pace (hopefully not bursting) thus causing consternation to any passerbys who happen to look up and see an, apparently, solid object falling upon them. Hilarity ensues.
-- AusCan531, Nov 08 2012

More Bubbles of Doom Nude_20Bubble_20Gym_20of_20Death
[hippo, Nov 08 2012]

//filling the balloon with ferrofluid//

That raises the possibility of ferrofluid bubbles (ie, bubbles made of ferrofluid, but filled with air), which is intriguing.
-- MaxwellBuchanan, Nov 08 2012


The dag nabbed sulfur hexafluoride. Everyone talks SF but the stuff is thin on the ground. Where to get some, quickly, no questions asked?

The same effect desired here could be accompished with a helium balloon doped with the appropriate amount of water. Though as regards falling obects causing causing consarnication those inflatable party dolls might work better.

I can envision some bakers reluctance in that pedestrians might spirit away the party doll used for this experiment and there goes the party. A thin threadlike bunjee cord should trail behind to retreive the doll before she descends to grabby hand range.
-- bungston, Nov 08 2012



random, halfbakery