I came across a AWESOME cave but I didn't know how cool it was then because it was my first world but I didn't know how to place blocks so I kept on breaking EVERYTHING. now that the cave reached the surface I had to block it up because I didn't want to die by zombies. so I got some glass I kept breaking until I learned to right click so I did and already a lot of mobs came in and I thought I would die and much later I realized I was in creative. and even later I realized how cool and rare a cave like that was.
I cried.