Need to shit? Don't hold your poop in because science says it could very well kill you. Take a dump wherever you are. Of course, you'll have to get over your fear and disgust of public bathrooms now then.

According to the Mirror:

In fact, some experts are warning that, as well as the obvious discomfort, in extreme cases holding a poo in for a lengthy period of time could even result in death.

Those who repeatedly put off going to the loo run the risk of developing a dysfunction in the muscle used for pooing, say researchers.

You could die because not evacuating the evil that wants to come out will cause more harm!

So the moral of the story is.

Don't hold it in.

Ever.