I was grading some prefix/suffix homework today in which the girls had to find ten words with a prefix or suffix in their books and then write the root word of the original word. In the course of grading, I had two answers that totally made my day.
First of all, one girl found the word "button." The root word? "Butt."
But my favorite was the word "discuss." The root word, according to my other student, is "cuss." I laughed really hard on that one.
In a way, it makes sense I guess. "Dis" means to remove or separate, so if you removed the "cussing" from a conversation, maybe you could have a pretty decent discussion...