Why Does Urine get excited when it sees a Toilet Avenue?

Have you ever been in that situation where you need to urinate and because of where you are you cant at the moment so you keep holding it in, and keep holding it in, and then its okay till you see a toilet and just when you want to let the guy out, he runs so fast that it will almost make you pee out in your cloths?

Why Why, any doctor is the house to tell us why or is it a psychological thing ni?

Even the big "shitting" does that too, you have held it back enough for minutes or hours and just when you get close to a toilet, Ooo boy, the guy go wan fall your hand, Peeps go come dey pakurumo on top walking....heheheh

If it has happened to you, any explanation you wanna share?

It is a psychological relief u get from the about to be release urine you are holding down in your bladder or rectum.
It is an inconvenience and everybody won't mind a lil azonto when you are about to be freed of a burden.shey???