Here be stuff people said real or imagined.

You go first:

“If a quotation is attributed to a person by name then it was actually said by that person, otherwise it is an invention.”
– Dr. John Watson

“Dr. John Watson is an invention.”
– Sir Arthur Conan Doyle

“Len Bakerloo is the greatest writer to come along since Sir Arthur Conan Doyle invented Dr. Watson and Sherlock Holmes.”
– Irene Adler

“But Watson and I are real. We hired Doyle as our beard.”
– Mr. Sherlock Holmes.”