What should you do if you really have to use the bathroom number 1 and 2 and you can't hold it but someone is in the only bathroom?

The situation that you describe is a very difficult one. If all else fails, use a bucket, which you can empty out and clean later. It is, of course, more socially acceptable to simply wait until the bathroom is available, but as you say, sometimes you can't hold it.

If you do not have a bucket handy, sitting will help. There just seems to be something about the position that helps reduce the urge.

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