What's the scariest or most mysterious thing that happened to you in Minecraft?

For me...: I was playing peaceful mode and I was exploring in a cavern..Then I saw light! As I went closer I found out it was lava...I looked around the lava death pond. Diamonds!! I went into creep mode..but then something hit me and I feel into the lava. I started to freak out! Who or what pushed me..? I don't know..will i find out? Don't think so, but my world was a little weird...