Last night I found a huge flat cliff which I thought would be amazing to build my home in, really high up looking out over the world - I spent ages making a scaffold to get up there and start hollowing it out - the first block I removed turned out to have an underground lake behind it which poured out of the hole, washed me off my platform and swept me down a cavern system, miles underground which I then had to spend an hour making my way out of - I only had two torches at first and only enough wood for about 20 more plus a workbench to make a sword and more picks, plus I had to find the coal and iron to make them.
The feeling as I broke through to daylight though was amazing. Plus I think I'm going to incorporate the spring into my interior design.