In Afghanistan we were posted to a Combat Outpost for a month.
"There's a sea can full of water bottles, there's another full of food. There's some ammo, and watch out the road is mined. See you next week, goodbye!"
...While one might immediately think of horrible smell the worst part was a little more amusing.
When all the moisture in the bag started boiling, the bad began to expand, until finally it would pop. The resulting pop would sling a flaming piece of shit through the air with the sound startling close to what video games and movies use for bullets and shrapnel.
Would have been the most horrible war story ever should someone have gotten hit by one of those things.