Responding to a question from DUP Assemblyman Simon Hamilton, who, in his question, described Mr McGuinness as "the deputy", Mr McGuinness visibly bristled.
To cries of "Oh!", Mr McGuinness said: "First of all, I’m not the deputy.
"I’m the Deputy First Minister in a department where there is equality between the First Minister and myself. And don’t you ever forget it."
All he missed out at the end there was a dismissive "little boy".
Other than that, yet another small insight as to how ready the warring tribes in the semi-detached Teppee on the Hill really are for "devolution of policing and justice" .