Because it hurts.
Ouch :D
It's a reaction to your mind, I'd you get Hurt your basically trained to say ow or ouch.
ouch
Ouch! Yes! That DID hurt!
"Ouch" is typically used as an interjection to express sudden pain or discomfort, such as when you accidentally hurt yourself. It is a simple and direct way to convey that you are experiencing physical discomfort.
to say ouch in french u say aie.
The exclamation (interjection) is spelled ouch. (e.g. Ouch! That hurt!)
You say ouch when you feel pain.
Ouch, that hurt.
Wow, that thing is huge! Ouch, that really hurt! Woah, you really scared me!
Tell him that he will not hurt ur hand and then grab his hand and if you want to be funny say ouch when he touches your hand then say just kidding
A strong interjection is normally an introductory expression like: Woah! or Hoorah! or Ouch! or Yay! "Ouch! That bee stung me and it hurt!"