What am I?

I am a lunch money thief. What am I?

related riddles

I can fill a house or fill your mouth but you can never catch me in your hands. What am I?

I start new then become old. Start clean but be one dirty. I usually start big then become little. What am I?

Soft, hairy, from door to door. I am the pet that always stays on the floor. What am I?