I was at my local Walmart buying some clothes. I went into the changing room to try them on. I could hear some strange noises in the stall next to me. Then there was a horrid smell. I literally thought I was going to throw up from the terrible stench. The attendant started to scream and carry on. I got dressed as fast as I could and got out of there. I did happen to see in the stall next to mine as I left was one hell of a mess. There was fecal matter all over the place. I heard over the PA system that they needed clean up in the changing areas and I told the nearest employee that they would probably need a HAZMAT team.