Originally Posted by overyonder
And one would have to get a bit creative to bypass the no-flow valve that most modern propane tanks now have.
How so? All you would need is the attachment hose for a grill, etc. (I suppose that's "a bit creative" as opposed to trying to fill balloons directly from the tank valve, but it doesn't seem terribly difficult.)
FWIW, I've found citations of multiple instances of people purposely
creating propane balloons (particularly one notable incident in Calgary), but none of accidental occurrences.