The most pointless thing I can do is only ever remember one instruction when one person gives me two instructions simultaneously.
The most pointless thing I know is that the Field of The Cloth of Gold was a meeting spanning 2 weeks between the king of France and king Henry VIII in June of 1520 to show off the extravagance and wealth of the two countries and their monarchs, essentially a dick measuring competition if you wanted to call it that. This included festivities such as feasts, and even featured a jousting and wrestling match between the two monarchs. This was seen as a great success for foreign policy for England, and particularly for thomas wolsey, the advisor to the king from 1510 to 1529. This was following a peace treaty called the treaty of London signed 2 years prior to this summit where France and England, plus a few other minor states, signed a universal alliance - a peace treaty that declared the countries will defend each other if one was attacked and they would not fight each other. This failed very quickly and catastrophically in 1521, when Spain declared war on France, and England was forced to choose a side. England chose to side with Charles V, Holy Roman Emperor but also King of Spain, because Henry VIII was still married to Charles' aunt, Catherine of Aragon, thus causing the treaty of London to collapse in the worst way possible.