Once i was filling a cave with TNT (It was a HUGE cave at bedrock) just cuz i was bored : P
i was about halfway done, and aboult 3/4 the way to the surface. (thhe cave was near my home) when a creeper fell into the cave. this was when i first started, so i didnt realize how much tnt could fly when it was surrounded by explosions....... WELL my house... with lots of diamonds......... and my mob grinder (at this point in time i was playing legit. so even the TNT was legitly gotten) ... As well as the rest of my village... was gone in about 30 seconds... which was about a quarter of the length of the whole explosion......... Now i dont play with explosives that much