Originally Posted by Ira B

Goofing with friends as a teen and threw some in a fire once too. They didn't explode but did wizz around bouncing off trees.
It's a wonder no one put their eye out.

Originally Posted by JPMacG

The CO2 cartridges that were used in Crossman and Daisy air rifles in the 1960s and 1970s would explode. We would throw one into a camp fire and run. In a few minutes it would explode with a sound about the level of an M80. We once found an exploded cartridge, which had landed maybe 200 feet from the fire. It was torn apart and almost unrecognizable.

The manufacturers may have de-Darwinized the cartridge design since then.