system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do we say "Ow" when we're in pain?
gpt
Because we've been conditioned (trained, basically) to say "Ow" or "Ouch when we're hurt by everyone around us since birth doing it.  Other cultures and languages have other words to express pain. Seriously, yell "BUTTERED TOAST" if you want, there's nothing physically requiring you to say anything.