Things that end with 'tor'

A teacher asks her class to name things that end with 'tor' that eat things.

The first little boy says, "Alligator."

"Very good, that's a big word."

The second little girl says, "Predator."

Yes, that's another big word. Well done."

Then little Johnny puts up his hand and says, "Vibrator."

After nearly falling off her chair, the teacher says, "That is a big word too, but I don't think we can count it because it doesn't eat anything."

"Well my mum has one and she says it eats batteries like there's no tomorrow!"