Carpets have the effect of a dust pocket, with merit of sucking up dust and stopping it flying around, but you can say that effect backfires.

They determined to avenge their father's death on their uncle.

He avenged his father.

He will avenge the people on their oppressor.

The thief entered the house at the back door by the open window.

Burglars broke into his house.

Some burglars broke into my house last night.

You bit the hand that fed you.

It backfired on me despite my good intentions.

All my pains went for nothing.

You bit the hand that fed you.

They are bitter enemies.

Thou preparest a table before me in the presence of mine enemies; Thou hast anointed my head with oil; my cup runneth over.

Don't bite the hand that feeds you.

Don't bite the hand that feeds you.

Don't bite the hand that feeds you.