When DSS was a pageboy, he understandably got bored during the speeches, sat on the floor under the "top table" and repeatedly shouted "Fuck, fuck, fuck" at the top of his voice. This went down very well with the bride's family, who were strict chapel Methodists.
He also made one of the bridesmaids cry by telling her that she was fat and ugly, and so was her dress.
He was the most appallingly behaved child I've ever known until he was about 5.