How Does It Know?

Agreed, but there are those inconvenient times when it doesn't. Also, when it does not may be at a location that is the worst possible scenario. I would not want to tempt fate if I happened to be shopping in some big box store, but it could be worse if it occurred in church.

I had to have an infected perianal cyst removed. The doc was explaining how the anus was extremely sensitive and the nerves could. “….tell the difference between a fart and a BM”. He didn't explain how - only that it could! I'd put his assesment at 96% accuracy!