In 1961, a letter from T.S. Eliot to Groucho Marx launched a three-year correspondence in which the famed poet and equally groundbreaking comedian exchanged conversation and occasional insults.
An unlikely pairing, certainly. For a writing prompt, consider other unlikely duos who might strike up a friendship or acquaintance. The pair might be friends or rivals, could have a significant or only passing relationship. Throw two famous people together and see what happens.