Yes, I've heard of a conundrum.
My 9 year grand daughter came home from school today with a homework assignment that falls under the category of conundrum.
There's a lonely man who lived in house for 2 months.
No one ever came to visit him and he never came out.
One day he left the house, he turned off the lights and put out the fire.
After he left, 90 people died.
What happened?