I was once in a Congregation where the original Presiding Overseer (and his wife) continued to rule the roost even though i long ago had become a revolving position. When there'd be a matter brought to the congregation for consideration from the platform, he'd take the discussion over from his seat in the audience, talking back and forth across the Hall back about the matter with the other Elders and leaving the audience and the Brother on stage who was conducting the meeting, completely out of it.
One time when our Hall was due remodeled, the new color scheme was put to a Congregation vote. The congregation chose one scheme but this Elder's daughter was due to be married and his wife vetoed the colors because they wouldn't "go" with her daughters Bridesmaids dresses.
This former P.O's wife's comments during the Watchtower study, were often condescending lectures to the audience. It got to the point that the C.O. said during such an occasion, that Sisters need to refrain from preaching to the audience when commenting at meetings. Everyone worked hard that day at suppressing their laughs.