being able to make up a pun is one of the things that demonstrates mastery of a second language. my high school had a lot of kids who came from foreign countries so there was a class called "English as a Second Language" for all those kids. at the end of the year they had the top ten best students in the EaaSL (pronounced easel, like the thing you paint on) class enter a competition against one another to see who could create the best pun. it was right at the end of senior year, and it didnt count for a grade or anything, so the objective was really just to make the director of the english department, mr. sebeck, laugh. the ten students all turned theirs in (i read a few of them, they were halfway decent no doubt) hoping to get at least a chuckle out of mr sebeck. unfortunately, no pun in ten did.
Yeah I guess mushroom story would work too.. I was trying to decide whether to make it a sort identification style book with a moral, or a story with a morel (a type of mushroom)... I will consider this.