Tom Swifty

A Tom Swifty (or Tom Swiftie) is a phrase in which a quoted sentence is linked by a pun to the manner in which it is attributed. Tom Swifties may be considered a type of wellerism.
Origins
The name comes from the Tom Swift series of books (1910–present), similar in many ways to the better-known Hardy Boys and Nancy Drew series, and, like them, produced by the Stratemeyer Syndicate. In this series, the young scientist hero underwent adventures involving rocket ships, ray-guns and other things he had invented.
A stylistic idiosyncrasy of at least some books in this series was that the author, "Victor Appleton," went to great trouble to avoid repetition of the unadorned word "said"; elegant variation used a different quotative verb, or modifying adverbial words or phrases. Since many adverbs end in "ly" this kind of pun was originally called a Tom Swiftly, the archetypal example being "We must hurry," said Tom Swiftly. At some point...