"I have a dream." - This iconic line was spoken by Martin Luther King Jr. during his famous speech at the March on Washington in 1963. The line is often quoted as a symbol of hope and equality.

"That's one small step for man, one giant leap for mankind." - These words were spoken by astronaut Neil Armstrong as he became the first person to set foot on the moon during the Apollo 11 mission in 1969. The line is often quoted as a symbol of human achievement and exploration.

"Et tu, Brute?" - These words were spoken by Julius Caesar as he was assassinated by his friend Brutus in 44 BCE. The line has become a symbol of betrayal and is often quoted in popular culture.

"I am the walrus." - This line was famously sung by John Lennon in the Beatles' song of the same name. The line has become a symbol of the Beatles' psychedelic era and is often quoted in popular culture.

"Ask not what your country can do for you, ask what you can do for your country." - This line was spoken by President John F. Kennedy during his inaugural address in 1961. The line has become a symbol of civic duty and public service.