Answer:
Who is it that rows quickly with four oars, but never comes out from under his own roof?
What doesn't get any wetter, no matter how much rain falls on it?
I am the hole in the night, the ever watchful eye. I return in a cycle, to enlighten the sky.
There is someone, and there is always another, for without the other, there wouldn't be one
It is the electronic version of junk mail or a salty meat in a can.
What did the piece of wood say when he saw the screwdriver and screws approaching?