The wug test is something you do to prove that young children are internalising the rules of the English language. You show them a wug, and there is a short dialogue: “This is a wug. Now there are two of them. There are two _________ ?” Most children over two or three will know the answer is wugs.
I was just googling this and found there’s a wealth of wug related material.
Firstly, there’s a lovely website with many of the original drawings, from 1958.
This is quoted in the wikipedia page for Jean Gleason, who devised the test and a bunch of others I’d not seen before. “This is a dog with QUIRKS on him. He is all covered in QUIRKS. He is a _________ dog.” and even better, “This is a very tiny wug. What would you call a very tiny wug? This wug lives in a house. What would you call a house a wug lives in?” which prompted the commenters to speculate – wuggery? wug-wam? wugloo?
Then this fabulous cartoon.
Some lovely comments on Arnold Zwicky’s blog.
I once tried to use wugs as a spring board to talking about German plurals but it proved counter productive. We got a little bit obsessed with wugs and kinda didn’t pay a lot of attention to the actual real point of the lesson.
Oh look, you can even get a wug mug!