Once, I was right by my base and I grew a gigantic tree right next to it. I jumped on to one of the branches and I accidentally missed a step and I fell down, losing half my health. Earlier that day a creeper blew up in the spot I fell down on, so I quickly built a wall around myself, put torches, and waited the night. Once it was safe to go, I dug a cave from where I fell down into my safe-houses basement. So, the bright side is, I expanded :D