Final-Fan said:
So I'm playing Single Player. I got sort of lost, because I couldn't find my way back, but on the other hand I didn't really care since I still had plenty of inventory space left, so I just kept going in unexplored directions.
Anyway, I'm backing away from a skeleton-heavy big room when a creeper gets me from behind. "WTF?" I think, "I didn't think I'd left any darkness behind me for a long way." So I check and sure enough, there's a ledge close behind me it dropped down from.
I go up there investigating, and find another creeper. Kill it. Keep going. Another creeper. Kill it, keep going. Five seconds later, another creeper -- am I going to find a creeper dungeon up here? I see moss stone! It is a creeper dungeon! Wait. I find a zombie inside.

Zombie dungeon. With creepers spawning like mad and only one zombie. 
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i was about to say i did not think there were creep spawns.... i read that mods can spawn 7 of a type at a time though
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