The Lord Mayor's Show 2007
Now, we blithely call vehicles in a parade "floats" but I don't suppose you've stopped to think why - this photo may give you the hint. Yes, that's right, for may years the Lord Mayor's parade floated down the Thames. But the story doesn't end there.
In years gone by, the Taylors and Skinners companies were rivals. They fought over their position in the parade - number six and number seven and one year someone drowned. The Lord Mayor decreed that from then on they should alternate between position six and position seven - hence the expression "at sixes and sevens".
The "number of things" competition on Friday is still upon until tomorrow, the day the changes arrive.