My epic fail is as follows. Please laugh at my expense. I did.
I have built myself aground floor so far of my house. Wood blocks, planks, stone and cobblestone. Looks nice, so I think. I have done a little bit upstairs so far. But what I really wanted was a basement. So I excavated that under the house to the same dimensions. I then figured I should install a fireplace. So, off I went, gettin Obsidian to create a Nether portal to collect Netherrack. Came back, put the Netherrack in and ignited it. What I didn't think ahead was, I had a wood surround, and ceiling 2 blocks above. Cue, raging fire everywhere. Took out the surround, the ceiling and spread on the ground floor. Took out the entire side wall of my house too. Now I have rebuilt the house, and put in a glass surround.
Looking for people to join me in an epic Minecraft build once again. Its in creative, so if you are interested, message me for details.