I wrote to Pratchett once upon a time. Told him Mort would make a great film. He told me he’d already been paid to write the screenplay. I probably still have that letter somewhere.
I got to meet pratchett several times. I liked that he had a library stamp he would use when he signed your book. When I was 10 I thought I'd be really clever, and I asked him who Death was before he died. He spent a good 3-4 minutes explaining to me how that wasn't how it worked and about concepts rather than bodies and I felt really stupid