Why do people pee themselves when scared?

Really, is there a scientific reason for why people pee themselves when theyre scared? Or any answer?

It could be a medical condition and, I think the reason why people tend to make accidents when they're afraid, I think that's a nervous habbit and, there are ways to fix that problem.
Otherwise, I don't know that exact reason.

I think its because they forgot to go to the bathroom before. then they get so scared they go

Its smt we inherited from the primitive man. It allowed men to run faster when a wild animal would hunt them

The autonomic nervous system has the sympathetic component being a major player in fright, and it serves to relax the urinary bladder wall smooth muscle and constrict the bladder sphincters thus preventing urination; it thus appears contradictory for one urinate when under fright. It would appear possible in say people who have urinary incontinence to pee possibly after the fright response when the parasympathetic nervous system is no longer under relative suppression.