simple machines

This past week, we were learning about simple machines and how they only have a few parts. I was asking questions about the story of the week during one of my small groups. Here's how one conversation went with a student:

Me: C, what is an example of a simple machine?

C: An electric......eel.

Me: No, that's an animal.

C: An electric......power bill.

Me: Simple machines don't have to be electric. And a power bill is not a machine. :)