It's normal if something prompts you to say it. For example, if you see the number 10,000 written somewhere, then I think it's perfectly acceptable.
I would only recommend saying it if you're with a group of friends, though. Otherwise people will think you're talking to yourself. Talking to yourself in public is not normal.
I would only recommend saying it if you're with a group of friends, though. Otherwise people will think you're talking to yourself. Talking to yourself in public is not normal.