Utterly Mad

You know, I find it's best not to apply the Laws of Thermodynamics to RPGs.

Once, the party I was DMing for tried the whole "Peasant Railgun" trick (3000 peasants, readied actions, one spear, RAILGUN). They even paid to hire 3000 peasants and everything.

So I allowed it... but I also fucked it up by ruling that the spear had grown so hot from the amount of energy it was picking up and from the friction it was experencing that it literally melted the hands off the peasants after #1000. Also, it shot straight towards the castle they were aiming at, went through it, then continued at a tangent off the planet in the direction they had thrown it... and hit the moon, causing it to explode and rain down bits of moon rock on the planet the size of castles.