Answer:
Without me everyone would lose their head.
Weight in my belly trees on my back nails in my ribs feet I do lack.
I come with a train and go with a train and the train doesn't need me but can't go without me.
Tuesday, Sam and Peter went to a restaurant. After eating lunch, they paid the bill. Sam and Peter did not pay. Who did?
I am what no man ever yet did see, which never was, but always is to be. What am I?
If you count 20 houses on your right going to the store and 20 houses on your left coming home, how many houses did you count?