Mine is when I die from falling down in Hell and loss everything, EVERYTIME!

You should of added a Dragon Exterminator that uses a gidded missle rocket launcher or maybe an LMG when a dragon apears. Very cool idea's btw

When you find an astroid, don't mine all of it up! Leave it so you can kill Aliens and get a chance to get a ton of Diamonds

To be completley safe from the zombies, build a Sky Fort (Keep in mind that dragons can still attack)

Want to farm some loot? dig down to hell and crate a stair case and kill as many zombies as you can and you should be able to get stuff like Iron ingots and Copper ingots

To avoid getting your stuff looted from other players, hide your crate behind a wall or under the ground so you'll keep your valubles nice and safe.

I'm even planning on making a animation film about CMZ :P