Answer:
I am always running but I never get tired or hot. What am I?
Marking mortal privation when firmly in place. An enduring summation inscribed in my face.
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
You walk into a room with a rabbit holding a carrot, a pig eating slop, and a chimp holding a banana. Who is the smartest animal in the room?
If you have me you want to share me. If you share me you don't have me. What am I?
What did the piece of wood say when he saw the screwdriver and screws approaching?