A Horse of a Different Color 完全是另一回事，风马牛不相及

Doo:The Wizard? But nobody can see the great Oz!
Even I've never seen him!
Dor:I've got to see the Wizard.
The Good Witch of the North sent me.
Doo:Prove it!
Sca:She's wearing the ruby slippers she gave her！
Doo:Oh!So she is! Well,bust my buttons!
Why didn't you say that in the first place？
That's a horse of a different color! Come on in!
But first I'll take you to a place where you can tidy up！