Know any classy puns?

Puns are repeatedly bashed as low humor, but they can rise to the level of art. There’s the classic gem penned by Sir Charles Napier, commander of British forces in India in the 1840s. After subjugating the province of Sindh (against orders), he wrote a single-word communique back to headquarters: “Peccavi”. Perhaps the most surprising thing about this annectdote is that the recipients of the message understood it- “peccavi” is Latin, meaning “I have sinned”.

Can you think of any other examples that rehabilitate the pun’s image?