But the rudest one may have already occurred.
Pranksters have mown a giant penis into a famous lawn on one of Britain's most exclusive streets.
Homeowners in Royal Crescent, Bath, were stunned to see the phallus on the grass outside their homes on Thursday morning.
It appeared overnight but no one knows who is responsible or why they did it - though a large coronation party is planned on Saturday.
The street is known globally for a "perfect lawn'' surrounded by a crescent of plush 18th century homes.
A flyer for the “grand coronation party” reads: “Celebrate the 300th anniversary of the Georgian era.
“Decorate your own regal crown, watch demonstrations on royal fashion and visit the Georgian Cook cooking up delicious recipes in the kitchen.”
Rise in support for referendum on keeping monarchy
Ahead of the coronation, a new poll has revealed a rise in support among Britons for a referendum on whether the country should continue to have a monarchy.
YouGov polling found three in 10 Britons (31%) think there should be a referendum, up 9% since the firm asked the same question in September last year.
However, this is still a minority opinion: overall, more than half (52%) do not think there should be such a referendum.
Watch: Future of the Monarchy: Why is Charles underestimating the danger posed by his own family dramas?
It comes as several planned protests against the coronation have been announced, with the police also looking out for people who plan to disrupt the main event.
Forces have warned there will be an "extremely low threshold" for protesters who can expect "very swift action".
Meanwhile, the King is facing a backlash from two Commonwealth countries, with Belize and Jamaica suggesting ahead of the coronation that he could be removed as head of state.