Hard riddles to test your mental acuity

Pencil on the floor-Hard Riddle

How can you put a pencil on the floor where no one can jump over it?

Answer: Put it by the wall in the corner.

Two fathers and two sons are in a car, yet there are only three people in the car. How?

Answer: They are grandfather, father, and son

A house of wood in a hidden place. Built without nails or glue. High above the earthen ground It holds pale gems of blue.

What kind of fish chases a mouse?

It is an insect, and the first part of its name is the name of another insect. What is it?

How much dirt is in a hole that's two feet by three feet?

What begins with an "e" and only contains one letter?

How can you physically stand behind your father while he is standing behind you?

Answer: You are standing back-to-back with your father.

I drive men mad for love of me, easily beaten, never free.

Take one out and scratch my head I am now black but once was red.

Take away the whole, and some remain. What is it?

Imagine you are deserted on an island lighted up with fire. You have no bucket so you cannot use the seawater. How do you escape?

Why do ducks have tail feathers?

What can fill a room but takes up no space?

 Jared's father has three sons, Snap, Crackle and?