One of these things is not like the others. People should be able to control talking (assuming they know it bothers the people around them).
I know there are medical conditions that prevent you from controlling all three - I've had coughs bad enough that I couldn't help it, and there are definitely bowel conditions that mean your sphincter isn't 100% reliable, and there is Tourette's and assorted mental conditions that basically make it difficult to impossible to control your speech.