A Catelyn of Thrones (14.1)

If there was a House Dumb-Idiot of StupieLand, the matriarch would be Catelyn Stark (or Tully, as it were) and the sigil for House Dumb-Idiot would be a crude depiction of the synapses in Catelyn's brain lighting up as she takes advantage of a situation to further her personal agenda of escaping from the North and stumbling into her own circle of power in the South.