The gas cans do go off well. We use a small butane oven most nights for cooking (no domestic oven or stove), and I threw 8 "empty" cans into the rubbish, and did not tell my wife (whoops). The wife put the rubbish into the 44 that we use as an incinerator, set the bin on fire and came inside. There was suddenly a series of bangs, and not much incinerator left, and I was in the doghouse for several hours.
Tjupurula