Final answer:
The question references a fictional event from the movie "Mr. Peabody & Sherman," but it is associated with the real historical context of the French Revolution and the Reign of Terror, during which King Louis XVI and Marie Antoinette were executed by guillotine.
Step-by-step explanation:
When Mr. Peabody and Sherman traveled back to the time of the French Revolution, instead of Mr. Peabody's head, a different object fell into the beheading basket. This question seems to originate from the animated movie "Mr. Peabody & Sherman," which includes a comedic and fictional portrayal of historical events. In the context of the French Revolution, the violence and the methods of execution, particularly the guillotine, are significant historical points. The French Revolution led to the radical period known as the Reign of Terror, where thousands, including King Louis XVI and Marie Antoinette, were executed by guillotine in a public display meant to showcase the power of the new revolutionary government and the end of monarchy.