On Mon, 28 Apr 2014 13:37:13 -0700, Ashton Crusher
wrote:

In the days before Microwave Ovens I (attempted) to heat a can of soup
in my regular oven. Turn the oven to 250, put the can in with intent
to take it out in a few minutes. Promptly forgot about the can and
went on about other stuff and 40 minutes later there was a VERY loud
explosion, the door of the oven shot WAY OPEN and then slammed shut
and there was a smell of burnt soup everywhere within a few
seconds...... I repeated this a week later with almost the same
results except I remembered about the soup after only 25 minutes of
cooking. When I opened the oven, with one arm in front of my face, the
can was bulged out like a basketball and I carefully lifted it out and
placed it in the sink to cool off. That was the last of my attempts
to heat soup in the oven.

I've heated many a cans of food in a 155 Howitzer. Disconnected the
heat pipe line from the heater. Cans would swell up and bulge at the
top. Let them cool a bit before you puncture the can with a P38. You
can get stuff all over the cannon breach and ammo