I have a couple Creeper stories, both on the same server, within two days of each other:
With Gregtech installed (as you may know), macerators are not cheap early game. I was the first one on the server to have any sort of machinery. I let the community use it and it was fine. I eventually found a nice Meadow to live in, and was mainly living outside, and teleporting using Mystcraft to the admins volcano-house to sleep. I had almost finished my house, and came through the age to my house and saw a creeper on my newly upgraded machinery. I had a rotary macerator, electric furnace, compressor, and geothermal generator being pumped from the nether. Right next to here was my ME Network with every single thing I had. I immediately sprinted, but was lagging. Of course, the creeper went boom all over my machines. My geothermal was gone, my macerator, furnace, and compressor. Thank GOD my ME Network didn't blow, I would have lost everything. I had to remake all of those things, which cost quite a bit early game.
I've just finished my house, and fully moved in, SWEET! Let me just light this bad boy up. I had an upgraded barrel in the basement along with all of my chests. The upgraded barrel had around 300 stacks of cobblestone, and next to it is a normal barrel filled with netherrack (quarrying the nether). I go downstairs doing a mob check (can't sleep because of monsters). Oh, hello, Mr. Creeper. I would have killed it immediately if I didn't miss with my Power V bow. KA BLAM! My barrels blow, a couple Iron chests blow, and some of the floor. As you can imagine, 300 stacks of cobblestone, and 64 stacks of netherrack, along with 3 iron chests, nearly filled with stuff spill all over the floor. I lag, so hard! I attempt to make a couple barrels to clean up the mess, also worrying about a lot of my useful stuff despawning, but want to get rid of the lag. Lesson learned: SPAM YOUR BUILDINGS WITH TORCHES UNTIL PROPER LIGHTING IS INSTALLED!