misdemean, misconduct, mishave, mess about, misbear, misreact, mismanage, improper, misact, misinteract, more...

behave, act appropriately

act up, behave badly, carry on, cut up, make scene, raise Cain, raise hell, run riot, more...

behave badly,   act badly,   act in a wild way,   to do something bad,   do bad things,   act (up),   act out of line,   to get into trouble,   be bad,   act villainously