Answer:
A mechanism to discover who is following you.
What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?
Very helpful if you intend to go gently down a river.
It belongs to you, but other people use it more than you do. What is it?
The part of the bird, that is not in the sky, Which can swim in the ocean and always stay dry. What is it?
This food is a tortilla filled with cheese and sometimes chicken before being heated or cooked.