Haha, reminds me of one time early in my minecraft days when I stayed up allllll niiiight exploring some caves. After passing through a few uneventful tunnels, I came across a new/dark path that immediately branched in two. I heard spiders and skeletons somewhere to the left, so I erected a dirt barrier on that side to block them off, and went right. Proceeded a little ways, turned a corner, dead end. Turned around and OGOD SPIDER JUMPING INTO MY FACE AAAAAAAAGH!!!!
Yeeeah, it startled me so severely that I shouted a death-yell loud enough to wake the whole house up. :U
Turned out I had missed a spot in my hasty construction of the dirt wall, and a spider, the little bastard, must have gotten through it and then snuck up on me completely silently until the moment I turned around.
****ing spiders.