Zapinator

The Zapinator was a weapon that was accidentally left in the game when released, but taken out in a subsequent update. It resembled an NES-era light gun and shot very rapidly, dealing 50 damage per hit - around 500 damage a second. This was a weapon that Terraria's creators used during testing without worrying about enemies.

Trivia

 * I have no idea
 * lol
 * trolol