"Thank you for sending me a copy of your book; I'll waste no time reading it."
"This book fills a much-needed gap."
(attributed to Moses Hadas)
"I didn't attend the funeral, but I sent a nice letter saying I approved of it."
(attributed to Mark Twain, probably incorrectly)
A: "I am enclosing two tickets to the first night of my new play; bring a friend, if you have one."
B: "I regret that I am unable to attend the first night. I shall be happy to come the second night, if there is one."
(usually recounted as an exchange between George Bernard Shaw and Winston Churchill)