I was reading the comic Goblins today and came across an old strip where children are calling each other names.
The first calls the second a tit mouse and the second counters with pussycat. Then the first comes back with penis monkey and tries to convince the other that "it's an animal." The absurdity of the statement is itself funny to me but the kicker comes in the next comic when, in the first panel, a goblin shares a story beginning, "so there I was, surrounded by penis monkeys ...".
The missing animal is, of course, the famous ball hog.