Angel-fish pin given by Mark Twain to Louise Paine. Photo courtesy of Heather Morgan, Mark Twain Library, Redding, CT _____
Upon returning to the United States, Twain was offered honorary membership in Yale University 's secret society Scroll and Key in 1868.  Its devotion to "fellowship, moral and literary self-improvement, and charity" suited him well.
We chose the most difficult German words we could find and asked people learning German to pronounce them. Here's what happened, with pronunciation tips.
A different saying with a distinct meaning is sometimes confused with this adage. QI has a separate article on this topic: Never wrestle with a pig. You both get dirty and the pig likes it.
The true and lasting genius of humour does not drag you thus to boxes labelled
'pathos,' 'humour,' and show you all the mechanism of the inimitable puppets
that are going to perform. How I used to laugh at Simon Tapperwit, and the Wellers,
and a host more! But I can't do it now somehow; and time, it seems to me, is
the true test of humour. It must be antiseptic.
- quoted in Sydney Morning Herald , September 17, 1895, pp. 5-6.