The oblivious, slow driver that no one can pass leading a long line of aggrevated drivers behind him, like he is the Grand Marshall in a parade.
Geezzis... I wish this Grand Marshall would pull the freak over so I can get to work!!!
The grand marshall is the person of honor in a parade.
Some woman was a grand marshall because she was ninety years old, making her some small town's oldest resident. If she can get a parade honoring her for that, I'll have no trouble becoming a grand marshall.