A puppy pile is any random group of four or more forumites all snuggled and collapsed together. Reasons can include watching a movie with not enough places to sit comfortably, the end result of a tickle war, or simply wanting a warm and soft headrest. Puppy piles are wonderful things. It's a very comfortable feeling to be curled around people you trust and can let yourself get close enough to to let your guard down. Generally happy things.