Did you see them try that on Mythbusters? They shot several rounds into a full propane tank, but it never exploded. They tried armor piercing rounds, which did puncture the tank which releases a big ball of gas, but no flame. Eventually, they shot a bunch of incendiary rounds from a gatlin gun at it and it finally when up in a huge ball of flame.
But, just for safety's sake, don't try it at home
I am sure there are YouTube videos of it if you search there.
that's because the mythbuster guys are a bunch of amatuers, you're supposed to put a roadflare next to it to ignite it when it goes poof... sheesh, kids today...
Once the game is over, the king and the pawn go back in the same box.