#1 - The Blood Moon
So here we are, the #1 most insane moment from my early forays into Terraria in a multiplayer setting. I remember the first time it happened, I was deep into the third cave level, not knowing when the sun was rising or setting, and I got a message: "The Blood Moon is rising." That was followed by a confused "wait what?" from one of my companions on Skype. Curious, I returned to the surface, where I could see the moon.
What I found was carnage and chaos.
The Blood Moon basically means that nowhere is safe. Zombies and Demon Eyes can force their way through your doors and into your house to pummel your characters and murder your townsfolk. The enemies also spawn in greater number and with greater frequency. But the last, most devious change is that those sweet little five HP bunnies turn into murderous Corrupt Bunnies, who have greater health and damage than the zombies themselves. Watching a purple rabbit maul your friends while you try to fend off the zombies that have invaded your home is a mortifying experience...and part of what makes Terraria just so F-ing great.