YOU SAID:
A lawnmower ate my purple hairball.
INTO JAPANESE
芝刈り機が私の紫色の毛玉を食べました。
BACK INTO ENGLISH
The lawn mower ate my purple hairball.
INTO JAPANESE
芝刈り機は私の紫色の毛玉を食べました。
BACK INTO ENGLISH
The lawn mower ate my purple hairball.
You've done this before, haven't you.