Another Derp I did (and it's actually a long series of derps, so please bear with me) would be when I made my automated steve's carts tree farm. I first made the cart with all the modules I though I needed and placed it down, supplied it with 128 saplings and waited.......and waited.......and waited.....it wouldn't move. At first I though it was power but it was fully charged from the solar panel and had a stack of charcoal in the engine, but it wasn't moving. Then I realized that the saplings in it weren't supported, they where the origin saplings which required the special module. So I went on an adventure to find Oak Saplings (since my base is literally floating above a huge ocean, with the closest land mass being a origin/swamp biome), finally got the saplings, put it into the cart and watched it move along. Figured I had 100% automated it, then realized I needed the advanced smelter........waited the 20 minutes to get the smelter module off, then waited an additional 20 minutes for the advanced smelter to be put on. Finally I had it auto-wait how do I get the charcoal in the engine again? I kid you not I didn't remember you have to click on the button till it shows the engine module. So I just manually filled it for a while, then my bad luck spurt got a lot worse. I had just made my first mystcraft mining age and was coming back to find my tree farm had stopped.... then I heard the hiss.....apparently the tree farm had stopped in the middle of the night, after cutting all of the leaves off of I'd say a quarter of my farm (it's a huge farm).....the creeper spawned on top of the now exposed wood log, jumped down and roamed freely thanks to my chunkloader....to right behind my character..........It ended up killing my character and creating a whole into my then bedroom. Even better, there where several other creepers that where around and if they had jumped down they wouldn't have just taken out my bed and my character, no no no that would have been a slap on the hand. I had the brilliant idea at the time of putting my ENTIRE power generation system right behind my bedroom AND my entire storage system. I cannot tell you how fast I jumped off my base to protect it from further harm. I ended up actually running away until I was far enough away for them to despawn, then teleported back and placed Portal Gun Turrets around my base so that if anything spawn they'll be taken care of. I've also since, moved everything around so a single creeper can't bring me to my knee's and even secured them as well as fixed the Steve's cart farm. So yea, note to anyone who plans on making a Steve's carts farm, make it separate from your base with some kind of defense so a creeper can't troll you.