Before I was teaching in a general ed classroom, I was a paraprofessional for kids with special needs. On this particular day, one of my favorite kids was working on something where he had to look things up in an index. He was also learning to define "index," so I was kind of quickly quizzing him in between problems:
"Good job. Now, what's an index?"
"That stuff you clean windows with."
"Um, I think you're thinking of Windex."
One step at a time...