There is something about some places that make you feel like holding your breath back. Some public toilets for instance. You feel scared to breathe deeply for fear of ingesting the bad odour in the toilet, even if in rare cases there is no ammonia odour and there is just the smell of odonil or harpic or domex that you are breathing in, yet, you don’t feel like doing it. You want to do the job quickly and get out as fast as possible but chances are that you are there because you have controlled it for too long and it is unbearable now. You don’t feel like looking around also, lest you see something disgusting. You want to make minimum movements for fearing of touching some part of the toilet. You are suspicious if the floor is wet. It may not necessarily be water.
You feel stuffy and wait to finish and rush out.