WTH? So while I'm running today, I kept hearing this slap/pop sound periodically coming from my...chest. I kept looking around trying to figure out what was causing that sound. I was not wearing ANY equipment, so I was totally perplexed. The sound was pretty loud and it sounded like those little firecracker things that you throw on the ground that explode. I am left to conclude that it must have been "the girls" slapping together. I tried to test the theory by swatting them around trying to purposefully recreate that sound. But I couldn't. All I succeeded in doing was scaring my neighbors. But that's nothing new.