Did ancient warriors run headlong into battle shouting “For [their cause]!”

No no that’s Bonsai, Banzai was a battle cry for the emperor, if you didn’t raise it you may very well end up being forced to commit Ikebana.

No, that’s a popular Japanese grill where they cook the food in front of you.

You’re thinking of Hare Krishna.

Or maybe Hairy Karaoke.

As long as you aren’t forced to sing “Take Me Out to the Ball Game” with Harry Caray.

That’s a good one! I’ve actually used a few of these variations as aliases. My favorite is “Amos Borodino”. It just has a great sound to it.

Yeah, it actually means 10,000 years and the entire saying cry was 天皇陛下万歳 Tennoheika banzai, which is along the lines of “long live the Emperor”. The first part, The Emperor, is said with less emphasis and flatter and I presume the charge itself starts with banzai.

There are a number of Japanese words that got completely mangled when adopted into English, including karaoke and harakiri.

I had to reset my brain to see why this is funny.