Answer:
What does a WW1 Trench, A Submarine and a Popular Phone App all have in common?
Hold the tail, while I fish for you.
I saw a strange creature. Long, hard, and straight, thrusting into a round, dark opening. Preparing to discharge its load of lives. Puffing and squealing noises accompanied it, then a final screech as it slowed and stopped.
What two things can always see what the other sees, but can never see each other?
I heard of a wonder, of words moth-eaten. That is a strange thing, I thought, weird. That a man's song be swallowed by a worm. His blinded sentences, his bedside stand-by rustled in the night - and the robber-guest. Not one wit the wiser. For the words he had mumbled.
What did the piece of wood say when he saw the screwdriver and screws approaching?