YOU SAID:
There's a duck on your head!
INTO JAPANESE
あなたの頭の上にアヒルがいます!
BACK INTO ENGLISH
There is a duck on your head!
INTO JAPANESE
あなたの頭の上にアヒルがいます!
BACK INTO ENGLISH
There is a duck on your head!
That didn't even make that much sense in English.