搬起石头砸自己的脚

bān qǐ shí tou zá zì jǐ de jiǎobanqishitouzazijidejiao

1. to crush one's own foot while trying to maneuver a rock (to a cliff edge, to drop on one's enemy) (idiom)
2. hoisted by one's own petard

Study it in Yanamino