In 1922 J.M. Barrie wrote to A.E. Housman:

Dear Professor Houseman,

I am sorry about last night, when I sat next to you and did not say a word. You must have thought I was a very rude man: I am really a very shy man.

Sincerely yours, J.M. Barrie

Housman wrote back:

Dear Sir James Barrie,

I am sorry about last night, when I sat next to you and did not say a word. You must have thought I was a very rude man: I am really a very shy man.

Sincerely yours, A.E. Housman

He added, “P.S. And now you’ve made it worse for you have spelt my name wrong.”