YOU SAID:

I can't believe I'm really doing this, man, this is crazy!

INTO JAPANESE

こんなことしてるなんて信じられない、おかしい！

BACK INTO ENGLISH

I can't believe you're doing this. It's crazy!

INTO JAPANESE

こんなことをしてるなんて信じられないクレイジーだ！

BACK INTO ENGLISH

I can't believe you're doing this. You're crazy!

INTO JAPANESE

こんなことをしてるなんて信じられない頭がおかしい！

BACK INTO ENGLISH

I can't believe you're doing this. You're out of your mind!

INTO JAPANESE

こんなことをしてるなんて信じられない気が狂ってる！

BACK INTO ENGLISH

I can't believe you're doing this. You're crazy!

INTO JAPANESE

こんなことをしてるなんて信じられない頭がおかしい！

BACK INTO ENGLISH

I can't believe you're doing this. You're out of your mind!

INTO JAPANESE

こんなことをしてるなんて信じられない気が狂ってる！