Bonfire Night

It's one of the names for this day in Great Britain. In 1605, Guy (Guido) Fawkes was captured in London as part of a conspiracy to blow up Parliament. (He, along with twelve others, had managed to put barrels of gunpowder in the basement of the building undetected.) He was later tried, convicted and executed as a traitor. Ever since, it has been the custom in the U.K. to burn Fawkes in effigy (hence the bonfires) and set off ridiculous amounts of fireworks to celebrate Parliament not being blown up. Some probably wish the conspirators had succeeded.

Remember, remember the fifth of November
Gunpowder, treason and plot
We see no reason why gunpowder treason
Should ever be forgot.