More Far Side cartoons from Gary Larson’s Wiener Dog Art (though not involving wiener dogs): three playful variations on formulaic expressions.
First, a very silly variation on the compound wharf rat:
The brown rat, common rat, street rat, sewer rat, Hanover rat, Norway rat, brown Norway rat, Norwegian rat, or wharf rat (Rattus norvegicus) is one of the best known and most common rats.
Such wharf rats hang around wharves, as do seafarers of all sorts (so that wharf rat is also slang for someone who frequents wharves).
Then a larger fixed expression, a famous quote:
You know how to whistle, don’t you, Steve? You just put your lips together and blow.
Finally, a still more complicated, punning, one, based on a proverb:
People who live glass houses shouldn’t throw stones, as the proverb has it. Or in the more complicated pun (which requires some lead-up), people who live in grass houses shouldn’t stow thrones.