Now I suppose we know exactly how Jon felt ...

 

... the years of telling him to go get the balloons for the party ...

... the years of telling him to change the diapers and LIKE it ...

... the years of telling him what a LOOOSER he is ...

PHOTOS: "Dancing With the Stars" Season 10

Because Tony Dovolani got exactly the same treatment last night ...

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"Tony & Kate Plus Eight..."

Tony quit. Then he remembered -- he's supposed to take the abuse because he's getting PAID to take it, and he returned.

Didn't help. 

Kate is not a natural -- except at abuse.

Here's the clip: