1. Steve Martin

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via Chattering Teeth



2. John Cleese

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via Anomatia



3. Mr. Rogers

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via jasonlovestummyrub 



4. Space Ghost

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via SilentDis



5. Conan O'Brien

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via lettersofnote



6. Joe Biden

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via igotpride



7.  Kurt Vonnegut

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via alxmog1



8. Rupert Grint (has there ever been a written document that better captures the mind of a 14 year old?)

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via KatherineGrace



9. David Bowie (in response to his first American fan letter!)

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via sandradodd



10. And finally, this very long and very helpful letter from Ren & Stimpy creator, John Kricfalusi.

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via lettersofnote