In reply to Robert Durran:
> Sticking them on a camp fire and standing well clear is excellent entertainment. A full one is even better.
Plus 1
In the 1980s we used to have an annual beach BBQ and the climax of the evening was a full industrial sized cylinder.
You needed a very low tide, so that the bonfire was well below high water mark and when the cylinder was placed on the glowing embers we could retire a good 200 to 300 meters away.
A very very spectacular fire ball went up into the air.
The coastguard appreciated advance warning.
No longer considered an environmentally friendly exercise.