Hacker Read

ams6110 | karma 28057 | avg karma 2.52 · 2010-08-20 06:19:54

There are other lighter-than-air gasses that could be used, e.g. hydrogen. Problem is that I think all of the practical ones are either flammable or toxic, maybe both---a bad idea at a kid's birthday party.

Tichy | karma 16300 | avg karma 1.62 · 2010-08-20 12:10:53+00:00

flammable sounds like extra fun

Luc | karma 11096 | avg karma 5.18 · 2010-08-20 17:24:38+00:00

Helium isn't toxic, but it can displace air without any feelings of suffocation. It's one of the simplest ways to a 'sweet death'.