Peasant Railgun

Our group once badgered our DM at the time into allowing the parties pet goat to deal some minimal amount of damage in combat. Then we backtracked and bought a hundred of them from the local shepherd and had a small goat army for a bit.

Unfortunately there was a flood shortly after and our goat army was lost

My experience with a few fun DMs is that you have to be really careful with the shenanigans. I'm not surprised at all about the flood that took out your goats. I'm impressed with the restraint demonstrated by your DM in fact... one of my old DMs would have almost certainly done something more damaging first; off the top of my head, good chance we would have woken up to discover that the goats had eaten all of our clothing in the middle of the night.

Perfect chance for the army of goats to be corrupted by dark magic and become evil goats that are intent on killing the party.