Me and my mate just had the most scary moments of are minecraft days. We were both mining, we decided to split up, I went one way and he went the other. I broke 2 blocks forward and saw a small 2x1 tunnel with redstone torches either side and at the end was a sign. It read "I'm coming for you". But the worst bit was that when we went closer to the sign a random creeper spawned out of nowhere. We would get screenies but were both too pussy the go back in the world. The thing is, I haven't actually seen Herobrine.