Little Johnny Again

A teacher asked her third grade class to name things that ended with tor that ate things.
The first little boy said,Alligator."
Very good James, that's a big word."

The second boy said,"Predator."
Yes, that's another big word Alan. Very well done."

Little Johnny says, "Vibrator."
After nearly falling off her chair, the teacher says, "That is a big word Johnny, but it doesn't eat anything."
Well my sister has one and she says it eats bloody batteries like there's no tomorrow!"